They all do about the same.
I happen to use the Yahoo! toolbar, since I have a Yahoo! email account. It has fast buttons for my mail, etc.
My wife uses the MSN toolbar for the same reason, she uses a Hotmail account and fast buttons for a Hotmail user.
Pick you poison, they all do about the same.
Soyo Dragon Ultra Platinum Edition powered by a P4 3.06GHz w/HT @ 533FSB
ATI Radeon X800Pro 256DDR <---Yeah!!! I finally got it!!!
1024MB PC3200, Creative Audigy LS, 2 x 40GB = 80GB RAID 0
Windows XP Pro, DOOM 3, CS, UT2004, BF1942 RtoR, CNC Generals
Finished Half-Life 2!!!!!!!!!!