With the Wacom tablets at least, there should be a tablet settings interface available after the drivers are installed. Set it to not use "mouse mode" and you may have to fiddle around with area scaling. (It's been a while, so I may be spotty on recalling things.) You don't want mouse mode, because it'll remember the cursor position and pick up from there instead of using the relative position on the tablet. Also if you have Vista or Win7 you may need to disable that gestures thingy. (I found it annoying and gets in the way more than it helps in regards to graphics software. It may be handy for taking notes on a tablet PC, but that's about it.)

The tablet should work with any graphics software once setup like that. The only problem I found is that in some cases software doesn't support pressure sensitivity or is able to tell the "eraser" end from the "nib" end.

I wouldn't be too surprised if there's a config file somewhere to fine tune things with GIMP, but then you'll have to get answers from the GIMP developers and more experienced users.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.