First things first :
Welcome home fellow switcher!
I have the very same config as you, coming from 10 years of windows / 5 linux here are the 3 apps I can't live without :
As much as I love thunderbird and firefox, I just stick to safari and mail, which have better... wait... no.. SEAMLESS integration to the os and the other iLife apps. Coming from a linux background, I was left mouth wide opened when I toyed with iCal and mail integration.
IT
JUST
WORKS!
And that's just great
And don't get me started on the integrated spell checker in safari forms (and most apps) ...<orgasm>OH GAWD YES!!!</orgasm>
Who said once you mac you never go back? Because I fear for my wallet that it may be true...
Oh one last thing: First thing to learn on a mac: You can install / uninstall applications by just dragging them to a folder on your hd. Usually Applications. But you can also rearrange it as you like then add a shortcut to the application folder on your dock, right click on it "et voila"! Start menu here you are
To try out the unninstall feature : drag the IE icon to the trash, then empty it, first thing I did on my pbook
)