These are just some links I've accumulated over the past year or so.
I'm including links to PDF copies of the pages hosted on my site, in case the original links go down (which for some of them seems likely in the near future).
carprogrammer.com - How GM Electronic Fuel Injection Works (http://www.carprogrammer.com/Z28/PCM/FAQ/How%20GM%20Electronic%20Fuel%20Injection%20Works.htm)
carprogrammer.com - How GM Electronic Fuel Injection Works (PDF Backup) (http://www.gtsdurango.net/files/tuning/gm_obd1/carprogrammer.com__How_GM_Electronic_Fuel_Injection_Works_20110830.pdf)
gnttype.org - Understanding Block Learn Multiplier (BLM) (http://www.gnttype.org/techarea/faq/BLMINT.html)
gnttype.org - Understanding Block Learn Multiplier (BLM) (PDF Backup) (http://www.gtsdurango.net/files/tuning/gm_obd1/gnttype.org__Block_Learn_Multiplier_&_Integrator_20110830.pdf)
moates.net - Using Dual Power Willem Universal EPROM Programmer w/27SF512 (http://www.moates.net/phpforum/viewtopic.php?p=3144) (by Kenny)
moates.net - Using Dual Power Willem Universal EPROM Programmer w/27SF512 (PDF Backup) (http://www.gtsdurango.net/files/tuning/gm_obd1/moates.net__Using_Dual_Power_Willem_Universal_EPROM_Programmer_w_27SF512_20110830.pdf)
And then a couple of useful links on this forum, as well:
HOW TO: Tune TGP Code :) (http://www.tgpforums.com/index.php?topic=4037.0) (by scott0999 - getting everything together & getting started)
IAC steps w/ 3400 5spd turbo (http://www.tgpforums.com/index.php?topic=3668.0) (5 speed stalling help)
Idle surge with bigger injectors (http://www.tgpforums.com/index.php?topic=4791.0) (rough idle help)