e-rewards is currently shut down for new members, even if you have gotten an invitation. odd, but true as of this AM.

the number of surveys you get depends on the profile you submit - the more categories in which you show an interest, the more surveys you get.

e-miles is a little confusing in that there are offers out there all the time - but you have had to go there to see them; they are not always emailed to you. they are changing some aspects of this site to make it more appealing.

and, as I said, e-rewards is shut down so for right now - emiles is your only option.