We aren't sure how much of this is set in stone and how much is just speculation, but Gossip Girl appears to be auditioning actors for the role of Gabriel Serrano.
www.uknowulovemexoxo.proboards102.com/index.cgi It's been up and running for a little while now and it's looking for active members. It's always being updated with pictures and is the best site I know for personal pictures of the cast