I just got back from FEDEX sending my 30D off to the CanonService Center for repair and/or cleaning. About two weeks ago it started showing a small black triangular object in the bottom right of each photo I take 
I don't believe this is sensor dust? It looks too regualr in shape and too dark for that.
Canon said 7-10 days to repair/clean. It was purchased new in Oct 2006 so the warrenty is still in effect.
Here is a sample of the issues at a 100% crop.
Wish me luck



