Handy Tweaks To Make GIMP Replace Photoshop | How-To | Smashing Magazine
GIMP is the favorite graphics editing program of many designers and graphic artists. It is free and compatible with Windows, Mac and Linux (the two big reasons for its popularity). It has a wide array of features, as well as plug-ins, filters and brushes. Documentation is primarily available in online communities, as well as through extensive add-ons.
And it now works with CMYK! And according to the article can now use Photoshop plugins! So WHY would anyone spend/blow the $$$ on Photoshop?