Molly's DS went wrong a while back. The touch screen just wouldn't calibrate and we needed it repairing. Friends of ours told us about the Nintendo Service Centre and how good it was.
We registered, got the freepost returns label and sent the DS off. Always a little worrying, sending something valuable through the post, but I shouldn't have worried. The website tracked the package, updated us when it was received, when it was repaired, when it was shipped out. And the postman dropped it off this morning. All fixed, no cost
A modern miracle; absolutely wonderful service. Thanks Nintendo.