Careers.Stackoverflow.com has one benefit for me. If an employer happens to find my resume, they can then browse through my SO answers to see how I work and how I think. I work very hard on my Stack Overflow answers and I would like employers to see what I can do.
But there are so many posts.
It would be nice if I could go through and highlight my best posts specifically to be linked with my resume profile (sort of a best-of). This link would be available for employers to peruse my most relevant posts without having to wade through a bunch of irrelevant fluff. It might also show tags I've participated in, average number of up-votes, and other information that might make me look good.
This would be a huge benefit to me and worth the price of admission many times over.