Pixelmator: A Photoshop-like image editing website

Pixelmator is an image editing tool for the upcoming Mac OS X system. It's by far the most powerful one I've seen, and it also has the prettiest interface. It's very similar to Photoshop and adopts the concept of PS layers. The image editing tools it uses are quite similar to those of PS. Friends who often use PS will feel a sense of familiarity.