MacConnection has been excellent too over the years. Most reliable of the big catalog vendors (the ones that originated with catalogs 20 years ago and still send them out).

Enjoy your new iBook!

Good intro info geared towards Windows users is here http://www.apple.com/support/switch101/ I particularly like this page http://www.apple.com/support/switch101/switcher/2/ to give to people somewhat familiar with Windows who have to get used to using Macs at our place. Sometimes just knowing a few basic moves can make all the difference.