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Nice article on how to make Gimp more useful:

"GIMP was never designed to replace Photoshop, yet with every
release, it comes a little closer to being able to do so. It can be
used to author graphics, create logos and edit photos, as well as make
short animations (using GAP). Despite these features, the open-source
app is a foreign world for many users switching from Photoshop.
Familiar tools are missing, menus are laid out differently and tasks
must be accomplished in unknown ways.
In this article, we list eight tweaks to make GIMP a more serious
Photoshop replacement option. Version 2.6 was used to test the
following tweaks, but past versions of the app should work as well."
Full article:
www.smashingmagazine.com/.../8-handy-tweaks-to-make-gimp-replace-p\
hotoshop/
Includes how to add filters, CMYK and brushes plus links to many free downloads.