It would be good to get a Post byline if you're a college student trying to get into sports writing. Otherwise if you're going to blog for free, why not just start your own blog, it's pretty easy to do on Google. Or better yet just stick to the message boards.
A couple years ago when they did the fan blog about the first year at Nats Park, the experiment kind of fizzled out, half the guys they signed up stopped posting after a couple entries, and by the end of the year there was only one regular blogger left. They didn't get a lot of comments, you'd get more feedback posting on WNFF. In the end the bloggers blamed the Post editors for the failure of the blog, there was too much lag time between submitting entries and having them reviewed and posted, one of the bloggers posted on the message board that he kept submitting entries through the end of the year but the Post never reviewed them.
What the Post needs to concern themselves with is finding a replacement for Kilgore, or better yet a senior beat writer. The Nationals Journal has dropped from the top Nats blog to #3 (behind the two ex-Times guys) on his watch. I've switched from the Post to Zuckerman for my main source of Nats news.