I just got my D50 last week and am trying to catch up with all the new stuff. I tried to find some tutorials on Raw Therapee, either on the command line or otherwise but couldn't find much. I rarely buy software for anything but I'm sensing that many people on these forums has spent a fair bit of money on something from Adobe. The only other free alternative I've heard of is UFRaw but again finding good tutorials is something that's eluding me. Please let us know if you find anything useful.
ADJ and also to trueindigo there are a couple more options in the open source world that I can put out there since I like to experiment to.
Dcraw all platforms - insanely fast minimal options all command line
Photivo all platforms - very detailed and lots of options (eg. 5 types of denoise, 5 types of sharpening, both bayered and debayered methods). When I want the most out of a raw file I use this
Darktable linux mac - great with color with stackable filters (eg. apply the same filter 5x differently each time), my favorite interface besting even LR after setting a few hotkeys, but it does not cache anything kinda slows things down
RawTherapee all platforms - as already mentioned this one is pretty nice
I have been able to do batch processing from command line with all of these except I have not tried with darktable yet. ADJ can you tell me what you use for video editing.