I just installed Tiny-Core Linux on my Raspberry Pi. This is a 64-bit system that runs completely from RAM. After boot, you could remove the SD. Boot partition size is 64MB :)
Get it from http://tinycorelinux.net/12.x/armv6/releases/RPi/
Unzip and dd image to SD.
Edit cmdline.txt on the Fat partition, add these:
showapps pause multivt kmap=qwertxxxx tz=xxx.
run "tce-ab", press 's', enter "mc", choose mc, press 'q' and 'i'.
Do the same for kmap.
Reboot, and have fun.
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