I've played about with RT (2.3) a bit, but I didn't really get on with it. I like an integrated all in one RAW converter / image editor, and I found RT missing a few things, such as 90 degree image rotate. I think there's a new version of RT (2.4) due for release soon - check here .

I mostly use LightZone for straightforward conversions without much editing, and UFraw / GIMP for the more finicky stuff.