Guess I'm in the minority, however I track my MS by simply knowing where I bought card and offloading them within a day of purchase, just seems like the best way not to get caught with my pants down.
I do however keep extensive track of rebates and the like and my typical spending. However the MS just gets written off as out from card/into BB mixed in with regular spend and bill pay.
Also all the talk of Quicken has interested me, so I may get on one of the FAR deals at Staples at some point and give it a whirl.