Times for Fun has released Red Pill (http://www.timesforfun.de/Red_Pill.html), a new image editor for Mac OS X 10.5 and higher. It offers a dozen tools and purportedly handles big images a as fast as Photoshop.
Features included: tools like magic wand, paint brush, paint bucket and clone stamp; a transform, adjust filter; paste into command; float/anchor selection; unlimited undo; the ability to resize, rotate and flip and image; a quick save command; a file manager; batch processing; and smart fill.
A trial version is available for download. Registration is approximately US$24. Red Pill is Universal Binary so runs natively on both PowerPC and Intel Macs.