I've just got a new netbook running Windows 7. I've not maintained a windows machine since 2001 (my home machines have been mac then Ubuntu, at work I use Debian). I figure I should give Windows another chance. Specific questions I have follow, but I'm really after any good tips and tricks for becoming a power user of Windows 7. What should I know? What are your top tips? Specific queries:

Which antivirus should I get? (McAffee is installed, but seems to be a bit of a hog).
Any useful keyboard shortcuts you can recommend?
How do I uninstall stuff?
What's the best online source of information on Windows 7?