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Nice idea.

Tip: I'd stay away from calling it a shortener. That market is very saturated and a lot of people will leave right away.

Play on the fact that your users can get commissions for millions of products across hundreds of merchants without even signing up.

"Just give us your email and we'll let you know when you made a sale."

Bonus idea: credit your users with a few small sales in the first few days. Funny, sexy or weird things that will get them talking about your service. They'll feel like it's working and you don't have to payout until they reach $10 or so anyway -- at which point your skim should have it covered. :)

Good luck!

[tommizzle]

Thanks for the feedback! Interesting idea about not calling it a shortener. I'll have a think about possible alternatives :)