I was buying a lot of article writing service (0% payment fees is nice!)
I shipped several orders from international customers in my http://store.gifti.us and accepted payments in bitcoins (0% foreign transaction fees is nice too!).
I bough steam codes.
I built somewhat profitable for short period of time site - http://betco.in and used some profit in bitcoins to pay for development work on open source project.
EDIT:
Bought, just like few other visitors, articles in PDF at http://ubitio.us. This is also project of mine and I am going to contribute it to open source soon, so just another bit into bitconomy.
And I am working on two other projects involving products/services and bitcoin :)
This is just what came in to my head right away...