Don't forget that going through ebates means automatically opening another clickrewards account in your @ebates.com email address, and having to email clickr. later to consolidate them... pain in the neck.
I found that starting shopping through clickrewards is not really necessary to get bonus miles (sometimes that means having to email them later to get it..) so you can get both rebates and miles. I would say dash is easier - although not as big as ebates - since you don't have to use another email address. To sign up off my referal, see the signature link.

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Get shopping rebates with http://www.dash.com/default.asp?arID...MID=1887280961