web 2.0 design + branding

I currently have a completed site, built using valid xhtml, but it's completely unstyled. I need someone with experience of the web 2.0 "look and feel" to create a design and branding for the site. You do not have to code the design, deliverables will be PSD's only. Your design will be converted to tableless xhtml/css so you must be aware of any possible limitations these may place on your design Providers with tableless sites in their portfolio are preferred