I use steepster as my inventory control, and try to keep it up to date when I get in new orders, or use up a tea. It's not as handy as a spreadsheet--can't really sort and view the teas in any desired order--but it's reasonably easy and quick.
I like the idea of keeping an inventory of teaware--I don't keep the boxes or receipts--too much to keep track of. I guess my flickr tea photo set serves as a 'virtual' inventory of some kind.
And today only one tea--a thermos of a Mu Zha Tie Guan Yin from Dragon Tea House. Quite a nice toasty TGY.