Addition to my previous comment: when I physically switch the drives, that is, 
switching the SATA cables, XP boots just fine. Of course, in this case I cannot 
boot into Ubuntu as the MBR of XP has no knowledge of the other OS on the other 
disk...
Possibly this is the same issue as bug #469568 (high importance + triaged)

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GRUB2 does not boot windows7 when installed in a different hard drive
https://bugs.launchpad.net/bugs/574732
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