Do you love astronomy? Have an iPhone and/or iPad? Then you should definitely check out the Star Walk app.
I'll probably do a more thorough review of the app at a later time, but for now the folks at Star Walk are holding a facebook contest where you can win the app for free. I was a little slow in finding out about it so the contest is already underway, but you can still enter and win.
By the way, if you already have Star Walk leave a comment and let me know how you like it!