Here is a decent article about switching. It gives 10 pretty good tips for users who are new to OS X. If you recently switched, check out the list because you most likely don't know all these things.
http://teenagefanboy.blogspot.com/2007/01/ten-things-i-wish-i-knew-before-i.html
http://teenagefanboy.blogspot.com/2007/01/ten-things-i-wish-i-knew-before-i.html