I found a few forum threads that seem to be about the same problem but haven't 
realized it's caused by ureadahead yet:
http://ubuntuforums.org/showthread.php?p=8641459
http://swiss.ubuntuforums.org/showthread.php?p=8643666

I'm observing the same thing at work (64-bit) and at home (32-bit). Even
when I drop to single user mode with no processes running and unload all
kernel modules, the memory usage is still about 300 MB and no indication
where the memory is used. Very frustrating.

Since I don't reboot often it took me weeks to make the connection to
ureadahead.

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ureadahead doesn't free memory after profile
https://bugs.launchpad.net/bugs/501715
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