The well-known alternative image editor Pixelmator
has gotten an update to version 1.1 bringing some eagerly awaited features. Besides better Leopard compatibility, the "Kitten" release adds support for pressure-sensitive graphics tablets, "over 100 New Filters," and third-party filter support by way of "Core Image Units & Quartz Composer Compositions." Another useful addition is a Quick Look plugin that brings easy image previews for "any of more than 100 image file formats supported by Pixelmator."
Pixelmator 1.1 is a free update to registered users. The regular price is $59 and a demo