Looking for orthos? Here's a decent reminder list that I published a while back... always useful for reference.. enjoy.
The data from the SDDS is available as a seamless product on the Seamless Data Distribution System see http://seamless.usgs.gov The imagery is available for online download as small files or larger areas may be purchased on media (CD or DVD). Looking for more free resources & FTP sites? Other Sources of Orthophotos & imagery are provide in this list:
Esri devMeetUps - locate a developer meetup taking place in a city near you
ERDAS Webinars - Register for a free, online webinar from ERDAS
ILMF 2012 - International LiDAR Mapping Forum, Denver, Colorado, Jan 23-25, 2012
Esri Dev Summit - The Esri Developer Summit (DevSummit) brings together developers and GIS professionals from all over the globe. March 26-29, 2012, Palm Springs, CA
Where2.0 - where the people working on and using location technologies come together to explore best practices and emerging trends in software development, tools, business strategies, and marketing. April 2-4, 20112, San Francisco, CA