This page is intended as a reference for address offsets and formulae for converting codes between different versions of a game (1.0, 1.1 on the same platform, or 1.0, 1.0 on different platforms, etc), so as to provide a centralized list. Without further explanation, I shall add a few. Feel free to contribute. Also, I (LB) have created a small app to carry out these conversions for you (GSHIConvert), which can be found in the Downloads section of GSHI.
Playstation (GameShark)
Armored Core: Master of Arena
1.0 to 1.1: add 00000060 0000
1.1 to 1.0: subtract 00000060 0000
Diddy Kong Racing
1.0 to 1.1: add 00000040 0000
1.1 to 1.0: subtract 00000040 0000
Driver
1.0 to 1.1: add 00000340 0000
1.1 to 1.0: subtract 00000340 0000
Driver 2
1.0 to Greatest Hits: add 00000540 0000
Greatest Hits to 1.0: subtract 00000540 0000
Metal Gear Solid
1.0 to 1.1: add 00000008 0000
1.1 to 1.0: subtract 00000008 0000
1.1 to Integral: subtract 00002780 0000
Integral to 1.1: add 00002780 0000
1.0 to Integral: subtract 00002778 0000
Integral to 1.0: add 00002778 0000
Mortal Kombat Trilogy
1.0 to 1.1: subtract 00000052 0000
1.1 to 1.0: add 00000052 0000
Persona/Megami Ibunroku Persona
(U) to (J): subtract 000004C0 0000
(J) to (U): add 000004C0 0000
Resident Evil 2
Regular Leon to Regular Claire: subtract 00000238 0000
Regular Claire to Regular Leon: add 00000238 0000
Dual Shock Leon to Dual Shock Claire: subtract 0000008C 0000
Dual Shock Claire to Dual Shock Leon: add 0000008C 0000
Regular Claire to Dual Shock Claire: add 00008080 0000
Dual Shock Claire to Regular Claire: subtract 00008080 0000
Regular Leon to Dual Shock Leon: add 00007ED4 0000
Dual Shock Leon to Regular Leon: subtract 00007ED4 0000
Regular Claire to Dual Shock Leon: add 0000801C 0000
Dual Shock Leon to Regular Claire: subtract 0000801C 0000
Regular Leon to Dual Shock Claire: add 00007E48 0000
Dual Shock Claire to Regular Leon: subtract 00007E48 0000
Tekken 2
1.0 to 1.1: add 000000C4 0000
1.1 to 1.0: subtract 000000C4 0000
Tomb Raider
1.0 to 1.1: add 00000100 0000
1.1 to 1.0: subtract 00000100 0000
Tomb Raider 3
1.0 to 1.1: subtract 000003AC 0000
1.1 to 1.0: add 000003AC 0000
Nintendo 64 (GameShark)
Diddy Kong Racing
1.0 to 1.1: add 00000040 0000
1.1 to 1.0: subtract 00000040 0000
Nintendo DS
Pokemon Diamond and Pearl
JPN to NTSC: subtract 00001860
NTSC to JPN: add 00001860