I use Idimager lite to catalog my photos. It also does a number of basic image edits that I use all the time. It is allot like a basic version of Lightroom. (everyone please note the word BASIC! I have tried the Lightroom demo and love it but cannot afford it.)
For more intense editing i use Gimp. I like that the Gimp comunity has allot of plugins available, and so far it does everything I have needed. The clone tool is my K100d's dust reduction system!
For RAW files I have just started using Raw Therapee. So far it does allot more then I had expected. It does more then I understand. For now it is all I need.
As I learn how to use these tools, I expect I'll find cases where I will be limited. Then I will start to look at buying some software. But so far, the software I am using has exceded my expectations tenfold. These are all free downloads.
If I had the cash, or could get a student version, my dream system would be Lightroom, with Photoshp CS3, and Adobe Bridge. I have no idea what Bridge is used for, but remeber this is just a dream.
I do know that software can be a very personal thing. So, take the time to try the demos before you buy. That is if you buy... Rember to look at the help files, consider customization, how is the toolbar layout, do YOU find it intuitive? During the demo and trial period, do you look forward to using one package over another? Does the software ultimatly do what you want?
I'm note sure why I wrote all this when the question was "what do you use for RAW". So, for your question: I use Raw Therapee.
Eric.