The simple cable HDMI to DVI won't work. However, adapters that have HDMI as input and various output options like RCA, S-VIDEO, VGA, DVI - should work. You could try cheap HDMI to VGA adapters, they were working well too.
I've connected mine to a full-HD 38" Samsung TV via HDMI, and got very nice display at 1280x720. Very happy with that. :-) It is not clear though how I would get the higher resolution which is blocked with "*THESE RESOLUTIONS REQUIRE ACTIVE COOLING TO WORK PROPERLY" message. How to do that? Is there a fan connector on the system board? I would be willing to add a fan etc.. if possible.
The other note on HDMI monitors, I would add, is that I also needed to change "HDMI output mode" to 1080P_60Hz, in Display, in Settings. By default, the TV was up-scaling the picture, and it was not super-clear. Now, after the output mode change, the picture is perfect. :-)