[UPDATE] Since Apple have now decided to give away a Bumper or other iPhone 4 case themselves, MobileFun have stopped their free case offer. They'd given away nearly five thousand in the week that the promotion was running - wow!
I mentioned the iPhone 4 reception problems in a previous news roundup post. It seems that Apple aren't going to be giving away free Bumpers to solve the issue, but my friends at MobileFun.co.uk have announced that they are giving away a free iPhone 4 case to cancel out the "death grip" effect.
The free case is like a transparent bumper style band round the sides with cut-outs to access the buttons. It's listed for £7.49, but their blog post has a code to discount that down to zero until the end of July or until stocks run out.
If you want a case that's a bit fancier, then they've got a whole shed load of other iPhone 4 cases to choose from.