Trash's Radius/KDS suggestion got me looking at other monitors that claim Mac support, and I noticed that my HP 2025 supports 832 x 624 @ 75 Hz and 1152 x 870 @ 75 Hz:

http://h18004.www1.hp.com/products/quickspecs/11484_div/11484_div.html

I'll have to see if I can get my current 8- or 10- switch adapters set to one of those resolutions. I can't seem to find a source for the Enhance Liberty adapters that he mentioned in the linked posts. Neither of my current adapters (Curtis and Viewsonic) have dials, but claim similar number of resolution/refresh rate combos as supported.

Thanks!

- Alex