sent a detailed email to tech support - fan stopped, card got hot, artifacts so badly now you can't read the screen, etc. - tech support said ok we'll replace it where do we sent the technician - I said just send me the card - no response for about a week then I start getting calls from "Ben" in Mumbai....."are you sitting at the computer now?"...guy didn't have a clue what I was talking about, said tech support had to authorize return....etc.
After a few chats with "Ben" got totally fed up and sent another long email to tech service filling in all possible text boxes with details about this 3 week process....finally got an email from someone else and the replacement card was on my desk when I came in to work today.
Next stop was a fun Christmas auction on Ebay for "Genuine Defective Dell Part!"

The only other real warranty stuff I've had to do was with HP and I've usually had the part in 3 days or less....