For a new user who visits this site for the first time, the "2.0" doesn't make any sense. Why add version number to your product name? It's fine to write about it in blog post announcement. But when I visit your site, I don't care which version it is. I know I'm using latest version that is live.
I think the name is "Careers 2.0" as in, this is the new version of how you manage your career. Before, you searched for jobs on job boards, sending out your resume, etc. Now, the employers come to you. Careers 2.0.
