Mariano is working on adding RFID support to Stuffkeeper.
This must be one of the  neatest  things I saw in a long, long time.

You can see screenshots, screencast and the code on his website:
http://www.devl.org/stuffkeeper/.

Now we need some data-collectors plugins so stuffkeeper will rock more!

Personally I think stuffkeeper is my best program yet  (idea wise, not code wise), but it has a long long way to go.