GeneralElectric - Yes, you need to re-register for each giveaway... There are several reasons for this which I won't bore you with, but it is indeed necessary to register for each one. The good part is that if you are getting out email news already, you will get notified when we launch a new giveaway campaign.
andrewd - Sorry, unfortunately we cannot verify if you have entered a particular giveaway. Mainly because we would do that in the past, but it became a habit for folks to ask us to check and the volume of those requests was simply too large for us to do that for everyone. You might want to keep a little text file on your desktop with a list of the giveaways you've entered already so you don't unintentionally DQ yourself...
Thanks for getting in touch and good luck!
Peace!