This is the scenario:
To the best of my knowledge you can set up replication (MySQL 4+) and in the my.cnf file have the slave either only process certain tables or have the master log only certain tables, either way will solve your problem.
Here is a guide to some techniques:
http://www.onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html
I have very few problems with replication set-up, all my problems came trying to sync DBs, especially after a reboot etc.