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i use firefox, have nortons and microsoft spyware. i don't use any sort of file transfer service and use gmail (i have opened 0 unknown emails in the past month).

i use a wireless connection, could these have anything to do with it?

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I would bet that this is most likely the cause (wireless). If you run virus/spyware programs, and dont mess around with email too much, or at least safely it was probably a wardriver/neighbor that did it. take a look at cain and abel, you will be able to monitor how many computers are associated, but most likely they passively sniffed everything. So get encryption for the wireless net.