Off topic but still relevant to the PCEngines Alix machine is a display-link USB monitor.
I purchased a Samsung U70 display some time ago but the old T1010 would not drive it, USB2.0 not availale. The Alix has USB2.0 so a bit of googling came up with the following links and it works nicely. Another purchase was a Rii mini wireless keyboard, these are on eBay and linitx.com, now I have a console attached to the Alix.
These links should at least point you in the right direction:
http://blogg.noonday.se/2010/01/28/linux-usb-video-adapter/
http://mulchman.org/blog/?p=90
http://plugcomputer.org/plugforum/index.php?topic=343.5;wap2
http://lists.freedesktop.org/archives/libdlo/2009-June/000125.html
http://forum.doozan.com/read.php?2,2073,2073,quote=1
http://mulchman.org/blog/?p=21
http://libdlo.freedesktop.org/wiki/HowTo
There was enough info to get my Samsung working, if I can so can you.