In case you didn't know (and use GIMP) version 2.4 is now out. It includes all the things I have become quite used to in the 2.3 dev version I have been running to date.
There is a fairly good review here
And it can be downloaded in source at the main GIMP website. A Windows installer is also available now.
Key features I like are:
- scalable brushes
- jitter brushes
- heal tool
- better selection tools
- improved colour picker (any where on your screen)