So... To upgrade my mk2a to 32MB, I'll need to get two of these chips:
http://www.micron.com/products/dram/edofpm/part.aspx?part=MT4LC4M16R6TG-5
from here:
http://www.9thtee.com/tivomemory.htm
or from Hugo.
Pin 14 on the RAM goes to pin 123 on the ARM. Easy.

Now... to upgrade my mk1 to 16MB, I'd just need to solder on 4 additional chips in the existing spots, but since there's less than 400 mk1's in existence and mine will be pretty unique, the chance of it actually being useful (like v3/kanji support and not just caching and a massive db) is extremely slim.
Regardless, I'll volunteer my mk1 to test this out. I'm not into software hacking though, so I'll need a bit of help with that. Mark, you stated something about a hijack hack?

Hugo, how much will 8 mk1 chips be w/shipping to denmark? How would I go about testing for duds?

I'm thinking it should be possible to upgrade a mk1 (and a mk2(a)) to 64MB or more, if I replaced all of the RAM chips... I can't exactly say I know anything about this, but shouldn't it be possible to replace 2x 16bit wide chips with 4x 8bit wide chips?
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#00182, 10GB, Amber, Denmark, Peugeot 206, Rebuilding my stereo - great things to come