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Useful references

bsnes, a modern, very hardware-accurate SNES emulator http://byuu.org/bsnes/
snes9x-rr, a modified version of snes9x used by the TAS community http://code.google.com/p/snes9x-rr
libsnes, a library that implements SNES emulation with bsnes's emulation cores. https://aur.archlinux.org/packages.php?ID=37582
libsnes implementation using snes9x core instead of bsnes: https://aur.archlinux.org/packages.php?ID=49339
python bindings for libsnes: http://gitorious.org/python-snes/
We might have free Genesis, NES, GBC, and GBA support by targeting libsnes: https://github.com/Themaister/libsnes-super

SMV, a format for storing SNES "speedruns" as snapshot- or reset-anchored input strings: http://code.google.com/p/snes9x-rr/wiki/SMV151
Timing and synchronization issues with these files due to the hackish nature of the old snes9x versions used to record them. Very difficult to reproduce these without going way out of scope for this project.
BSV, a format similar to SMV used in previous versions of bsnes; seems to have been abandoned: http://gitorious.org/bsnes/pages/BsnesMovieFormat
Supported by SSNES and older versions of bsnes-qt.
There don't seem to be many published "runs" in this format on the internet.

The current TASVideos record for Super Mario World (SMV143): http://tasvideos.org/1415M.html
Map of RAM values in Super Mario World: http://www.smwcentral.net/?p=map&type=ram http://alcaro.tk/ram.html

The TASVideos record for Tetris apparently employed a brute force search: http://tasvideos.org/2786S.html