I have not bug rather some points of enhancements for further versions.
Let me introduce my self I am texture artist of Team UnrealSP.org, currently working on UT modification Battle for Na Pali.

I decidet to move from Photoshop to GIMP and made GIMP my (and teams) development graphics application due to simple fact if I made something in an  "amateur" way there is beter to support other "amateurs" in their work.
But I encountered several obstacles.

1) as I wrote above in summarfy I found that GIMP curently do not support CMYK. well I am not sure if somebody else mentioned this before, but the absence of CMYK makes GIMP only half of an photo (and not only photo) editor.
I think that I am not only one texture artist or simmilar image-manipulator whom uses the CMYK to add a bit more richness and "3D" look to textures.

I use the combination of convert to CMYK and add brightness, contrast enhaced greyscale pic to K chanel of converted pic. but I am unable to do this in gimp due to:

1) absence of CMYK format
2) I have not find way how to copy image to channel (but this may be only my fault)

I would be glad If you could add this to Gimp/GTK (hopefully there are no stupid licensies/propreatary formats denying this)
If you could do this for (not only) me (but rather many other users of GIMP)
I definitely move to GIMP and make GIMP UnrealSP oficial texture making tool. which gives you possitive referee on GIMP.

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Additionaly, but not needed now (maybe in future)

could somebody write import/export pluggin for DDS format (DXT texturtes or S3TC)

Thanks.

I appreciate your Work on GIMP and other opensource programs.

Dušan "mcfarrel" Majtás
mcfarrel@centrum.cz

Team Unreal SP - Battle for Na Pali
texture artist

for further info on mod see:
www.unrealsp.org