It seems that web 2.0 is popular and successful at this moment and have become a trend on the web. Here is the list of online generator particularly for web 2.0 design.
Categories
Supporters
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I wrote a blog just like this a while back. It has many of the same resources, but also a few extra:
http://outlawdesignhosting.com/designblog/web-20-style-for-dummies/