Pixelmator 1.4.1 brings noise filter, Pixelmator Learning with it
There are also a few performance updates and bugfixes -- here's the list if you want to check it for something you're interested in. I still don't see my personal issue on there: it seems like whenever I switch between the Spaces on my Mac that hold iTunes and Pixelmator, the OS doesn't want to stay put -- it keeps jumping back to the iTunes Space while I'm trying to work on Pixelmator. Of course that might be an iTunes issue, but hopefully the Pixelmator team is looking into it.
Other than that, it's still a great app for editing and resizing images, and at $59, is definitely cheaper and simpler than investing in a big Photoshop suite. The 1.4.1 update will show up automatically for current users, and the app can be downloaded as a free trial from their site.