You can change rewards -- or sell out any that have backers and create a new reward. Just be sure to send an update to those backers letting them know they will benefit from the newest reward tiers!
Have you tried sending out press releases and if so you have to call and follow up on the press releases. We did that and now we have a interview with the local paper next week.
Thanks for that info, jimivy! Press releases have recently gone out, but I really didn't think about calling to follow up! Only 4 days left to fund and I am way behind!