Maybe this will help - From the Instiki FAQ:
Q: Okay, so I forgot my password. Is
there any way to recover it? I’ve got
physical access to the box it’s on.
(Actually it’s installed on my iPod
Shuffle!) Someone please help.
A: (0.10.2 and prior) rename the
latest snapshot to a .gz, gunzip it,
then look through it for password.
Ugly but worked for me.
A: (0.11.0) Login to the db for your
system and look at the contents of the
“system” table. For sqlite3 (the
db/production.db.sqlite3” and then
”.dump system”. I actually had the
issue when upgrading that there were
no rows in that table, so I inserted
one manually. ”insert into “system”
VALUES (1, ‘password’);”