A lot of people lump vanguards fund with the general junk funds. Its always been a lot more conservative, yet not so great yielding. They went nutty about 18 months ago dumping the lower end of the risk spectrum and beefing up on the higher credit, lower dividend stuff expecting something "bad" to happen that never did.
Its not a free lunch and its kind of a crappy lunch to boot, but if I held it in small amounts right now, dumping it wouldnt be my biggest concern or first priority. If I had a big holding I'd for sh*t sure find something better for it to do, and I strongly doubt I'd buy any more of it right now or anytime soon.
The GNMA fund has usually given you a little more yield than long cd's, without a whole lot of risk. Not terribly attractive the last couple of years though. I've kept looking at it and wanting it the last 3 years and never pulled the trigger.
On the other hand, when its about bonds...brewers the man.