I came across this Web 2.0 palette recently (over here). Nice colors and design are an essential component of most of the better Web 2.0 sites out there.
Rounded corners are in. This link explains how to get your rounded corners with CSS only.
Some more niceness (taken from the RubyonRails site):
A bit more candyfloss and feel good stuff (from Strongspace):
varun said
This AJAX Color Tool is quite neat.
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