And by the way. Some apps recommendations Astro - file manager, Jorte - Calendar, Handcent SMS, MortPlayer if u are into podcasts or audiobooks, PicSay - add speech bubbles to pics, RoboDefense Lite - Game, Air Control Lite - game, Rock Player - xvid video, Gesture Search to find contacts and apps fast, App Brain to find interesting apps!
ADW launcher to change all of the home screen. But wait a bit with that untill you know what works for you. That is actually a good advice generally. Do a little bit every day.
I stopped using advanced task killer and has not seen any difference. There are threads on that specific topic.
And btw add your email address to the user dictionary in settings. You will use it a lot to register everywhere. Be ware of dots though.