Much info about engine management http://www.diy-efi.org/
Site with nice tech info
http://wwwrsphysse.anu.edu.au/~amh110/
[Colin's website tries to make clear about all existing megasquirt variants] - GenBoard being the most advanced, but much experience from others can be used.
[EFI101 Forum of the EFI University], good info an varous emc's. Also a nice topic about [detonation]
A PowerPC controller based ECM:
http://feynman.ee.ualberta.ca/~jasmith/mpc555/docs/fp3.antelecom.net/tbehrens/aems555/results.htm
[http://www.avrfreaks.net/phorum/read.php?f=5&i=2027&t=1989" avrfreaks forum thread about engine management (need registration)]
[Another AVR-based squirting system by Nick Parker]
Efi332 is a very nice ECM system, it is a little laborsome though:
http://www.diy-efi.org/efi332/equations/algorith.htm
Megasquirt is the prophet of affordable fuel injection. It is about the same cost and labor to build as msavr, although it has considerably less functionality and free resources for future updates. It is very respectable that Magnus could fit ignition to it (with some limitations). It has incredibly detailed documentation (most of it is general to suit most efi systems, like msavr) and numerable success stories. Lance's megamanual and Erik's megatune is widely used in MS-AVR land too.
http://www.bgsoflex.com/megasquirt.html
Look in http://retro.co.za/efi/DIY_EFI/1995/archive68.txt for a great intro about many parts (drivers, trigger-amplifiers, knock sensors, even processors) useful in engine management. Look for the MGP20N40CL and look around.
Alexei Pavlov published some engine logs:
ftp://ftp.diy-efi.org/incoming/engine_log.txt
A realtime OS for AVR: RTOS: http://www.barello.net/
Threads in forums all over the galaxy - add links to vems related chit-chat
misc:
http://www.efi101.com/forum/viewtopic.php?t=27&sid=c8ae3b19715f0486354175f8908b9882
http://forums.nasioc.com/forums/showthread/t-393330-p-3.html
http://www.pgmfi.org/phorum/list.php?f=38&t=1079533310&a=3
http://www.ms-nordic.tk - Swedish MS-forum, now including VEMS as well
[very interesting advanced info on several topics] I wget it for myself.