Where can I find apps to download? What are some of your favorites?
word.
Google is a good place to start.
a good place to download applications would be from Versiontracker. there are also some cool blogs that have neat apps.
http://coolosxapps.net/ is a good one
my favorites, ones I use daily, are Quicksilver (from blacktree), PathFinder (from Cocoatech), Adium, Shiira (it's basically safari, but I like the interface more), menu shade (for when the menubar is too distracting).
Other good ones I use less often are Carbon Copy Cloner (for making backups of my drive), CandyBar, Delicious Library, Google Earth, iSquint, iStat menus (and iStat Pro), Onyx and Tinker Tools, Seashore, Senuti (for taking music from an iPod), Skype, SongBird, TextMate and Finally Think (to get rid of distractions).