richym, otomoto, smb, accord, dbit, sixtyk, gauss, jmors, greenj, odinv, etc. seem to be dummy accounts created just so that someone could play with Advogato's ranking system and perhaps use it to inflate their own certification.
Judy Arrays
A single data structure that allows ultra-fast searching, takes very little space and is also cache-friendly? "Judy Arrays" could to be the answer.