Congrats! Welcome to the
dark side.
Anyway, for software you need, you can always go to
MacUpdate or
VersionTracker and search for whatever you need. Or you can ask us. All in all, if you haven't received Sage's magical PM yet, get these things:
The Unarchiver - It virtually opens every filetype, it's as fast as the Mac's built-in .ZIP opener, etc etc. It's a musthave.
Quicksilver - It's in essence a lightspeed version of Spotlight and a super fast application launcher. Plus you can do so many other things with it with its Plug-in capability it'd fill a novel.
PithHelmet - Not really a program, per se, but it's a built-in Adblock for Safari. And it blocks practically everything. Of course, the adblock for Firefox is better, but only very slightly.
Adium - It just hit version 1.0, and IMO it's the best IM chat app on any platform ever. It has support for every major IM network, and support for minor networks you probably haven't heard of. Plus its customization puts Firefox to shame.
uApp - When you drag a program you want to get rid of to its window, it not only trashes the program but it also removes any hidden files it'd have put on your system (preference files, cache files, etc). And it's free, so you don't have to pay $13 for AppZapper for the same function and a useless sound effect.
MediaFork - It rips any DVD you might have to an .MP4 file, and it has many options on how you want to rip it. There is also
MacTheRipper, and it rips the entire DVD into a VIDEO_TS folder to play in DVD Player. It'll act like a real DVD, special features and all. But remember, don't use this for the wrong purposes.
Camino 1.1 Alpha - It's Mozilla's Mac project. It has Firefox's rendering engine, but it also has integrated support for all the special Mac features (Services, Keychain, OS Dictionary, etc) since it's a Cocoa browser. Now, I'd try finding
CamiTools - it's an all-in-one browser add-on that greatly, and I mean
greatly, enhances Camino with its features. However, the CamiTools project has been halted so it'll be tricky to find a copy (and ignore the warnings that CT doesn't work with the 1.1 alpha, it does). The browser is super fast, and super lean (it doesn't have freak memory leaks all the time so it doesn't use 300MB of RAM). All in all, Camino is a good alternative browser if you don't like Safari or if you don't like the clunkiness of Firefox.