Im also targeting fall 2011 entry- but mostly for 1 yr. overseas programs in the UK/Europe. I am actually looking to apply to one US program for Fall '10 for their third round (Wisconsin), but that application is somewhat riding on my GMAT score. Looking to take the test first or second week of March.
Right now am working with:
OG12
Princeton Cracking the GMAT (was a good intro/strategy book but beyond that...

)
Kaplan Premier (on hold at the library to pick up)
I will probably pick up a few of the
MGMAT books in areas that I keep turning up weak.
I started studying three weeks ago and work maybe 2-3 hours a night on it, weekdays and weekends, with a day or two off here and there. Currently Im working through the quant section of OG12 and am finding my abilities, speed, and accuracy picking up with each day- which is good to see! I have a Kaplan practice test scheduled for next Thursday so hopefully Ill see some improvement on my dismal 540 initial assessment test.