Here’s the digital workflow of one photographer. The steps he describes can be followed in the GIMP too.
Despite earlier reservations, I’m still shooting in RAW format and it’s been useful on occasion. I find it useful to slide the shadows and gamma settings around and then hitting “auto-adjust”.
I always have to use the Auto-Levels tool afterwards to fix the colours but the RAW converter does give me some extra control.
I can see I’ll need to make backups a lot more regularly however. DVD is way too small.