NOTE: This was cross posted from here
My team focuses on US Government customers and partners. To say that building accessible applications is important for our customers/partners would be a huge understatement. I just watched the following session from MIX09:
Building Accessible RIAs in Microsoft Silverlight
The session is short (roughly 20 minutes), but definitely worth the time if you are interested in how to build accessible apps with Silverlight. Check it out!