I use Pixelmator from time to time, it is essentially a functional Photoshop redesign. I still do use Photoshop for some things, Pixelmator has come a long way and can do most things, but there are still things that you just need Photoshop for. I do like the look of Pixelmator much better, and I like how a lot of the adjustments and filters work. Last time I tested, content aware fill seemed to do a better job in Pixelmator than in Photoshop, so that was cool.
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I actually prefer Stylebot a lot more than Stylish. There's no special code required, it has nice little sidebar to work in, has syntax highlighting, auto tabbing, live preview, syncs with your bookmarks, etc. I'd highly recommend it. But... then there's dotjs. It's like Stylish, but for javascript. It can take what you do with Stylish/Stylebot and make it that much more awesomer. Yes, awesomer.
Looks really good! I love how you've kept the layout pretty much intact and just cleaned it up a lot. Great work.
I have a semi-related tip for you if you're interested: you can use an extension like Awesome Screenshot to take a screenshot of the entire page and without the browser window.
Twitter: As a user I actually imagine the work of Dmitri Litvinov to be the most usable. Many other designs seem to be too generic or too crammed...