Although I've heard of this happening to other bloggers, I've never had it happen to me!
A reader won a giveaway back in August, and of course upon receiving her shipping information, I immediately forwarded it to the giveaway sponsor. (I double checked -- it's in my sent box!) Even though I noted that I would appreciate being kept in the loop regarding the giveaway prize shipping, etc. etc., I did not receive a response from the sponsor. This didn't worry me though, because up until now, the giveaways have always been speedily dispatched to winners from their respective sponsors.
Now it's over a month later, and the reader has contacted me to let me know she still hasn't received the prize. I followed up with the sponsor with an email, and DAYS later I still have not received a response. I've also tried contacting via Twitter but no go there either (at least not yet.)
Arghh! Going forward, I'm going to be EXTRA picky with the giveaways I host.
For those of you who have experienced the same thing, I'm curious to read how it panned out for you.