Here is a link to the list of wireless printers that Macworld reviewed in 2010:
http://www.macworld.com/reviews/collection/5606/Wirelessprint.html

Here is a link to info about AirPrint, including a list of AirPrint-enabled printers, for iOS devices:
http://www.apple.com/ipad/features/airprint.html

I was informed by our Apple rep that the new App Store is for consumers, not enterprise/education. Hopefully this will change in the near future so purchasing and updating apps on the Macs on campus will be possible through the App Store.