We're from the Secret Service. About your blog ...
Blog for your chance at an FBI/Secret Service file.
That seems to be what's happening to one blogger named anniesj on Live Journal who has a lengthy post about getting a Secret Service visit after a particularly pointed rant about President Bush. There's a second post, as well, with more explanation.
The original post has been taken down, but a poster on another blog says it had something to do with "stabs Bush in face with spork."
Of course, this is the blogosphere, and as noted on yet another series of posts, it's best to take some of this with a grain of salt. But as Steve Outing points out on E-media Tidbits, aside from the Big Brother implications, one lesson to be taken away, whether it actually happened or not, is that it well could in an era where posts live on forever courtesy of Google and other search engine caches.
Blog with care.