Swapped up to an 8GB microSDHC the other day, coming from a 2 gig standard microSD... When copying my files OFF the card, to the internal storage, it was going at ~1300-2000 kb/sec... nice and speedy.

Put in the 8gb, and went to copy them back and got MAYBE 100kb/sec tops... it was horridly slow, especially since this is a Class 6 card and the 2gb was a class 2.

I'll give this a shot, I hope it helps.