Here is some documentation I have produced over the years you might find usefull.
6502 Crib Sheet:
http://www.agerweb.co.uk/RetroDocs/6502CribSheet.doc
6502 Instruction Crib Sheet:
http://www.agerweb.co.uk/RetroDocs/6502InstrCribSheet.doc
68000 Crib Sheet:
http://www.agerweb.co.uk/RetroDocs/68000CribSheet.doc
68000 Instructions Crib Sheet
http://www.agerweb.co.uk/RetroDocs/68000InstrCribSheet.doc
Z80 Crib Sheet
http://www.agerweb.co.uk/RetroDocs/Z80CribSheet.doc
Z80 Instruction Crib Sheet