Much info about engine management http://www.diy-efi.org/
Site with nice tech info
[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.
A PowerPC controller based ECM:
[http://www.avrfreaks.net/phorum/read.php?f=5&i=2027&t=1989" avrfreaks forum thread about engine management (need registration)]
Efi332 is a very nice ECM system, it is a little laborsome though:
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.
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:
A realtime OS for AVR: RTOS: http://www.barello.net/
Threads in forums all over the galaxy - add links to vems related chit-chat
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.