I've been using Multi Monitor Taskbar (free)for several years on both XP and since over a year on Vista x64. It doesn't follow the XP/Vista theme at all, and the clock is fixed in US am/pm format, it can't be resized to double/triple height, and what not (see bottom-right of the page), but it does offer a nice second/third taskbar, display the time, an extended clipboard, and all the application buttons on the correct monitor(s), and can auto-hide, which is what I want/need it to do.
Personally I wouldn't bother for the pro version, it seems like a simple slightly pimped version.

Might be just good enough...

/Ath

Hm, still no mention of OpenProj, which I've been using (no connections 8)) for some time now: http://openproj.org/

Just got it from there, no problem. Do you have trouble getting it?