I started keeping track for the first three & a half months of this year. So far I haven't done anything with the data, but the intention was to add it up at some point, I think. :-P

Having just expended a huge amount of money to pay my taxes (damn you, Ottawa! And damn you twice over, Quebec City!), I too am now re-inspired to figure it out. It was very frustrating going to H&R Block and having them say "Oh, you know, if you'd done this, you could claim it as an expense!".