Something to aspire to
We're not up there yet, but I'm definitely looking at Writer's Digest list of the 101 Best Sites for Writers as something to aim for in the future. From Agent Blogs to Publishing Resources, Jobs and Just for Fun, this is a comprehensive listing of some of the very best sites out there on the web for writers. You don't have to check them all out, but I'm certainly going to bookmark a few and see what I can learn. And next year, if I'm very very good, maybe I'll make the list myself!
Best of luck with that! Other than having good content, the two things I've found that seem to help build a blog's audience are longevity and when the blogger comments on others' blogs. Still, so many writers are in search of good agent blogs, that word should get around anyway.