ConraDargo
Despite being a member of the community since late 2003, the name ConraDargo may not ring a bell in everyone's ears due to his low average of posts (1.1 per day) but this member has still managed to leave a mark on the community; his most noticable work consisting of a huge compatibility list for the SNES emulators PocketSNES and SNES Advance on Game Boy Advance in 2004, where he tested more than 2000 (!) SNES roms, and a personal guide to flashing a Nintendo DS Lite which was posted in late 2006 - only days before GBAtemp's own guide went online.
The name can also be seen on numerous other forums (namely Swedish ones) and is easily recognized and spotted by the avatar he always uses: the two mysterious eyes which covers the EU-case on the early 90's popular game Flashback (The Quest for Identity).
ConraDargo is also the author of two FAQs: Koinu Chan no Hajimete no Osanpo for the Game Boy Advance, and the japanese version of Nintendogs on Nintendo DS - for which he has received a lot of credit.