I had a seagate/outpost rebate rejected due to the "wrong" serial number... but without any calls, letters, or emails on my part the rebate magically appeared, about 2-3 months after the initial rejection. The other seagate rebate my "friend" sent in went through the first time.
So seagate did screw up on the serial numbers they gave the rebate processing company, but they did eventually make good on their promise.
OT: Seagate's reliability, warranty, and low noise have won me over. Do you remember the $99 250GB maxtor drives from last Black Thursday? I bought two: one has failed and was RMA'd, the other is beginning to throw errors in my log, hope it dies before the 1 year warranty runs out. Bought 4 seagate SATA drives around the same time, they are still churning away in a RAID configuration. I know it's not scientific, but since all the brands are nearly the same price I'm buying seagate.