If you have a touchpad and lion, you can go to System Preferences and Trackpad, and see all the new nifty multitouch things you can do with your trackpad!
Most of the libraries down here are hooked up with overdrive for ebooks, they work with several, but not all e-readers.
http://www.overdrive.com/default.aspx
Just hold the top both the top botton and the front button at the same time for 20 seconds (until you see the apple logo)
http://www.youtube.com/watch?v=SH4C2DhjN-s&noredirect=1
Walmart sells it, I got mine in Portland.
The first cheap one was called Square
Ringitup is a cash register program with Credit cards built in review of Ringitup
Olloclip makes different lenses that clip on your phone
If you dig around you can find a whole bunch more though
Amazon has several pico projectors
The one I showed off one from Brookstone at the meeting
IOS 5 is now hackable, and there is a store to buy apps called Cydia..
The highlighs for me are the tvout app that will mirror your screen for pre-iphone 4s phones
and WiFiFoFum which is a war driving app to find wireless access points.
is one of my favorite plain jane radar apps
If you go to settings, Messages, you can turn on 'Send Read Receipts' then people will know when you have read their messages.
Will let you scan a book, cd, or DVD and tell you what it is.