They
all come with Windows 7 installed, but it'd be nice if a volunteer with
experience in open-source software came in and got them to dual-boot
with a suitable version of Linux. Any volunteers?
Well, without wanting to start a complete firestorm, dualbooting Ubuntu 12.04 (LTS) via Wubi is really very easy indeed for 95% of setups [1]. Depending on your internet package, you might want to use the "Download Ubuntu" link in the bottom left, burn it to CD, insert CD, then run Wubi to avoid downloading Ubuntu three times over.
I did the same only last week, no problems whatsoever.