Here are some helpful links for all of your modding needs!

Nintendo DS Lite Repair Guide
A PSP homebrew guide
Playing PS1 games on your PSP
[url=http://tibia-mod.dreamwidth.org/​486.html]Tibia's Game Gear LED mod guide[/url]
Themadhacker's Gameboy Color overclocking guide
Frontlighting a Gameboy Color
Nobble's guide to overclocking a Gameboy
SS's guide to running a DS Phat without a top screen
SS's 3DS nub alternate solder points.

The list will be added to periodically.

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COLLEGEWAT

A list of completed handheld projects/mods:

Gameboy variants:
Bibin's LightBoy Pocket, an LCD mod
Bibin's GrapeBoy frontlight mod
Bibin's Electroluminescent Gameboy
Bibin's multicolor backlight Gameboy
Ishmael1010's backlight Gameboy Pocket
Ishmael1010's green-backlight DMG
Ishmael1010's painted Gameboy
Ishmael1010's very early '90s themed painted DMG
Ishmael1010's 3rd custom DMG (dmcnelly's commission)
Ishmael1010's 4th custom DMG
Ishmael1010's EL modded DMG
Jewjo's Gameboy Color battery/frontlight mod
BoFoSho's DMG backlight mod
BoFoSho's recased Gameboy
BoFoSho's rechargeable Gameboy mod
SS's modded Pokemon Crystal cart
Michealthurston's Gameboy backlight mod
Nobble's Gameboy red backlight mod
Nintendofreak's dragon stencil Gameboy
PalmerTech's Awesome DSi XL
PalmerTech's EL-backlit Gameboy
ColtHardic's GCBoy
Bush's Nintendex
Nintendofreak's Dragon Boy
Sonyportabilizer's pocket Gameboy battery mod
stuntpenguin007's Gameboy non-volatile game save mod
RedGameboy's LED modded Gameboy


Other:
SS's GP2x
PalmerTech's N64 DS casemod (youtube video only)
robm's guide to DOS on the PSP

The list will be updated periodically.

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JLEEEEEEEEEESUS