I submitted two ten dollar rebates for AutoVantage (after I'd cancelled my membership). Got a $20 check in the mail today! So, I'll go ahead and try it again during the next two quarters and see what happens.
A pleasant surprise. 
For May:
$5 gift card (received)
$20 gas rebate (received)
Longs rebate (waiting)
Rite Aid rebates ($8.48 and $4.99) (waiting)
AdSense (figure out 6/1/06)
Interest (find out 6/1/06)
Good news re: gas vouchers
May 6th, 2006 at 12:07 am
May 6th, 2006 at 04:39 pm 1146933567
May 7th, 2006 at 04:41 am 1146976889
May 7th, 2006 at 03:15 pm 1147014941
I don't know. I think I was a member when I bought the two tanks of gas I submitted. However, I'm going to submit the next two vouchers anyway and see what happens. Worst is that I'm out 78 cents.