usefulthings.org.uk

First, a nice css cheat sheet pdf:http://www.ilovejackdaniels.com/css_cheat_sheet.pdf

And secondly a nice colour picker dashboard widget http://www.colourmod.com/

Nice examples of multi column css layout here

While researching css I’ve found this useful site with an amazingly useful css browser support chart

I can never get css right first time, hopefully reading this might help me

This one is very nice, a simpler one can be found here. This is a simple RGB to hex converter and finally there are some usefull other tools on MediaGods.com