I just exchanged $50 e-rewards for 3000 HH points as well..It's amzing that those points posted to my HH account almost instantly!
After spent a few weeks trying to find out which award is best for e-reward money, I think HH is best for me. I don't watch too much movie and I don't ski. So the blockbuster and ski reward to me is a waste.
I used to redeme Hertz certificates but it seems like I can always find better deal through the internet without these certs.
For the airline awards, there are minimum fare requirements and cannot be used on line..