The creative works database can be accessed at cwdb.azaphrael.org.
This is not an archive of Role Playing threads or posts. In particular, it is not a "MT:tC" archive. Megatokyo the Clans material is archived on the TC Wiki.
This is not the only archival effort. DigitalLancer maintains the MicroTokyo MT Fanfiction Archive. A great deal of verse can be found on Negatokyo. Oop-Ack contains many fine pieces of fanart. The CGed Strips Database has colorized versions of Megatokyo Strips. And they say that one day, in our hour of greatest need, the haiku archives will return.