There is this spot of dust that just refuses to come off.... blow like 6-10 times already...
I also have a slight issue with my SD card slot... Don't know if it is my Sandisk Ultra or my slot. 8 out of 10 times I slot the card it, it will push the lock lever of the card to "lock" postion, stopping the card from being used. I use my CF card mostly, but my SD card is for overflow, and during events, SD card for backup (on duplicate mode). Only when I push the SD card in a certain will I be able to avoid this Locking problem..
So thinking of bringing it down for a warranty look see, and at the same time, ask to get the sensor cleaned. Who knows, they might do the clean for free. *fingers crossed*.