Everyone talks about how the applications within Facebook are awesome, which is true, they are, but they add on to Facebook. One app that I rarely hear about or see used though, the Toolbar for Firefox (http://developers.facebook.com/toolbar/)
This toolbar is awesome. If you have Firefox open, which throughout the day you usually do – it will alert you when your friends’ profiles update, or you get new messages, etc. Toast message popup’s.
I have found that by having it, you get more out of Facebook, also the search feature for your friends is a pretty sweet Ajax type search, built into the toolbar.
I recommend that any Facebook junkie check out the toolbar! Get on it! Oh, and if you aren’t on Facebook – why aren’t you – sign up! And add me as a friend! (http://www.facebook.com/profile.php?id=56011561)