Checklists and Manuals
This page will contain links to good, preferably real-world checklists, manuals and websites that contain information about procedures etc..
Fokker 50
http://home.planet.nl/~meij1945/ - checklists, performance data and procedures info for Fokker 50 by a KLM Cityhopper pilot
DC-9 and MD-80
Stellan Hilmerby's excellent website is a treasure for DC-9 and MD-80 builders, it contains practical information and also reference material for flight planning and information on how those planes are operated in real life. Stellan is a Scandinavian Airlines MD-80 captain. He also has very likely the best freeware DC-9 aircraft and panel for download there.
"Pilot Series" checklists archived
I dug these from www.archive.org since they had disappeared from the net: http://tigert.gimp.org/aviation/vatsim/cockpit-stuff/checklists/pilotseries-checklists/ - these are made for sim use, but supposedly they might be from real-world sources slightly edited. No clue how good they are, but probably worth a look
General Aviation Aircraft
My C172M checklist is here.
ESMO Flying Club has good lists for Piper PA-28 (and for PA-32, but it is in finnish
).