I build a new Arduino device this weekend. I was ill and had much time chilling at home and hacked this:
It is a TA01-11 LED matrix from Kingbright. It was a little bit tricky to figure out how it works because it was the first matrix I played with but at the end everything worked fine... ;) Thanks to Rafael for this great hacking session!
You could find more information and the code on my Arduino TA07-11 5x7 Dot Matrix Display page. Have fun!