Now, this is what I did when migrating from b2 Cafelog to WordPress 1.0.1.
If you did not rename the previous b2 tables, you just need to do these:
Big thanks to all developers and chatters at #wordpress freenode.net
Note: This is only an experiment. If you find errors or made a better documentation about this, will you tell your page? Thanks! :)
— Last update: January 28, 2004.