The following list is by no means complete, however, these are some of the fine, local government webmapping sites available from the Vancouverer, BC area.

VanMap is the city's flagship webmapping resource at http://www.city.vancouver.bc.ca/vanmap/
Powered by Mapguide, the site is served up via the normal plug-in required interface or, there's also a Lite version (no plug-in needed). Users can access:
property lines
zoning information
sewer mains
water mains
addresses
public places
orthos
much more
http://www.city.vancouver.bc.ca/vanmap/

City of North Vancouver - The City’s GIS Department has been an ESRI GIS site since 1989 and implemented an online mapping system using ESRI ArcIMS in 2001. The City has been exploring ways to leverage investment in the existing GIS system to enhance the City’s emergency preparedness. See the City of North Vancouver's GIS WebMap - http://www.geoweb.dnv.org/
http://www.cnv.org/default.aspx
 
Whistler Map - http://www.whistler.ca/Business/GIS.php
Through WhistlerMAP you will be able to navigate, at your convenience, to a variety of mapping related information including:
 
Property Information
Cadastral Data
Zoning
Protected Area Network (PAN)
Utilities and Servicing
High Resolution Aerial Photos
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The site already has Olympic info listed at http://www.whistler.ca/Vancouver_2010/Whistler_Venues/index.php

The City of Abbotsford, BC - Abbotsford launched the application, called WebMap, in spring 2002 making publicly accessible for the first time nearly all of the data layers that are compiled in the city’s existing GIS. The decision to create WebMap was driven partially by a city initiative to make electronic government a priority, although financial considerations were also a compelling factor. See http://webmap.abbotsford.ca/webmap/
 
Burnaby Map http://webmap.city.burnaby.bc.ca/
Another slick online mapping application offering up information from the city's Engineering department. You'll find population data, trails, environmental information, and aerial photos.
 

DeltaMap, another MapGuide application developed by Pacific Alliance Technologies
See http://64.69.85.208/ & http://www.corp.delta.bc.ca/
 
City of Surrey, BC - http://www.city.surrey.bc.ca/
http://www.surrey.ca/default.htm - COSMOS which provides the ability to query, view and print a wide range of City information such as zoning, aerial photography, utilities, parks, roads and recreation facilities.

District of West Vancouver web map - http://westmap.westvancouver.ca/westmapviewer/, once again, Mapguide Plug-in is required for this application.
 
Other related mapping applications - City of Nanaimo, BC Nanaimo Map
http://citymap.nanaimo.ca/ & http://www.nanaimo.ca/residents/index_inside.asp?id=117&collection=19 & http://www.nanaimo.ca/
Nanaimo is across the strait of Juan de Fuca West of North Vancouver and Whistler. The small city boasts and excellent GIS crew and has some fine online mapping. Of interest to you Google Earth fans, check out http://earth.nanaimo.ca/data.html a resource where you can access Google Earth KMLs including a virtual tour of the city's ddowntown and the central business district (kudos to Jason Birch on the continued development of this resource)
 
City of Victoria, BC, the Provincial capital - http://www.city.victoria.bc.ca/cityhall/departments_plnsur.shtml
Unfortunately, Victoria is a bureaucratic nightmare, the city of some 400,000 is actually carved up into about 13 or 14 local government entities, each having their own agenda.. the result... some pretty sad online webmaps, webmapping and supporting services. See http://www.city.victoria.bc.ca/business/about_map.shtml but don't expect too much! PS... I really like the PDF map of North America.. what the he#$# is that all about???
 
Some of the coolest and most useful maps and imagery from Vancouver and Whistler BC come from a private company... See http://www.mapsbyair.com/workshop/index.html McElhanney Consulting Services Ltd (MCSL), a premier provider of digital air photos, proudly offers their 1999 digital air photos of Vancouver, Whistler and the Fraser Valley, BC for FREE on the www.MapsByAir.com website. These colour airphotos from 1999 let you see ground details down to 50cm. In a related effort, see RealtyByAir.com from McElhanney Consulting Services - With RealtyByAir.com you can virtually "walk" your prospective buyers around a neighborhood and give them a comprehensive review of a home’s location from an aerial point of view.

County Resources - Finally, in most of Canada you won't find resources from County level government (although Ontario does have counties). Instead, in BC you'll find resourcess from Regional Districts. A regional district is a larger political jurisdiction with boudaries typically coinciding with watersheds, making management of natural resources, Water, air, polution more realistic. Regional Districts are made up of appointed officials, not elected officers and thus face much criticism and opposition. The city of Vancouver and some of the surrounding municipalities fall within the Vancouver Regional District and you'll find some maps online at http://www.gvrd.bc.ca/growth/maps.htm. For more information about Regional Districts in BC See http://www.bcstats.gov.bc.ca/Regions/regDist.asp.

Business notes: BC is geospatial "hotbed" in Canada with many large companies (Safe Software, MDA), small shops (Latitude Geographics, McElhanney, Municipal Software, ResMap), and consultants based in the Province. No doubt the 2010 Olympics will offer some amazing opportunities for GIS, surveying,  and mapping professionals. To stay abreast of RFPs and tenders you might wish to check out BC Bids at http://www.bcbid.gov.bc.ca/

Looking for more Vancouver-based companies or online resources? Simply use the GISuser "Search" utility and bang in "Vanouvcer" for plenty of interesting results. Did we miss something here? Feel free to ping info-at-gisuser with your comments.