The first thing I asked myself when visiting the site was: do these companies notice? My gut reaction is: probably not.
You will want to positively answer that question with some testimonials, or an overview of "granted deals", etc. Currently it just feels like a site with a bunch of people asking for free stuff.
Also, you could go even more Groupon-like by having people join in on an "Ask For A Deal" so it's not just one person asking, but a group of people. This will be a lot more interesting for companies as well and incentivizes users to spread the word about the deal they are asking for.
A company could respond: if you get 100 people to enter the deal I'll make it happen. Essentially you would be creating a self-service version of Groupon where the users are in control of what deals will be up there. Groupon meets Digg?
Marc Köhlbrugge