You are asking for legal trouble in a major way. Yelp seems fairly forward-thinking, so I doubt they'll come after you with their lawyer-guns blazing, but they could. And if you don't change your name, you'll leave them with no choice.

Then there's the whole TOS issue of reproducing Yelp content, and on top of that you're violating the copyright of the Yelp users who posted the reviews -- they gave Yelp permission to publish their review, but they didn't give you permission.

I like the idea, and I'd like to see you make it work -- not just for Yelp, but for all the major review sites. If you get the Yelp trademark out of your domain name, serve reviews from multiple sources (Citysearch, etc), and then use excerpts in a defensible fair-use way, then I think you might have something more workable.

Also, sell them framed. No one wants to find frames, and it's a great opportunity for you to create additional profit margin.