Good idea! Screen shots are your key to success, show the users what their message screens COULD look like once they use your material. Utilize the skins that the messenger has and project them on your site. It will build the immediate visual connection between your offerings and the final result.
Get your nav. buttons active and stock content. Divide between static and animated, etc.
Site loads quickly. The IMThings being a sub site of the proxy site is ok, it would be VERY beneficial if you'd offer a BACK button to get back to IM site once the user arrived on the proxy site, though.
Ultimately: More Content, more options to browse between your pages and better visuals.
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