The forum software is fine, it was just never set up correctly after they upgraded. Lots of important stuff missing, like the User CP link, and the ability to auto-quote specific posts.
Anyway, I'm also looking for headers. Several sites do sell sets of headers, adafruit and NKC I think both sell them. However, they're intended for wire wrap and the pins are actually too long, the shield stands way off the board.
I'm talking with Seeedstudio about it, and it looks like he might be able to get a run of them custom-manufactured. These would be female headers with square pins below, long enough to reach through a shield PCB and stand it off the Arduino headers a few mm to clear the Diecimila USB header and DC power jack. Say, 10mm pins.