The big e-Rewards thread is in the S.P.A.M. folder:

http://www.flyertalk.com/forum/s-p-m...er-thread.html

There are usually a few open spots in assorted program. While there are no guarantees of what rewards you'll be able to redeem for, the usual rule of thumb is that if you sign up under an airline program, you'll be locked out of redeeming for all other airline program redemption options but can redeem for the full slate of hotel, rental car, and misc. rewards available in your country. Same with hotel- sign up under a hotel, and that's your sole hotel program while you can have many airline redemption options.

To get the whole spectrum of redemption options, you have to have kind of lucked into either getting an invite from Ticketmaster (someone mentioned that in the main e-Rewards thread) or have the program you got your invitation from leave e-Rewards altogether (a bunch of us who were there on a Delta invitation)

Also note that while the mobile app can be quite good for getting surveys, the reward list shown on the app can be less than what you get on the web site. Example- IIRC, BA Avios are missing for me on the app but showing as available on the web site.