Im not so good a tutorial writer, But I do have a few relivant links.
http://dev.mysql.com/doc/refman/5.0/en/triggers.html
Thats the MySQL trigger docs. Pretty decent docs if you are used to the way Mysql.org writes there stuff.
I also picked up the new Oreilly "MySQL: stored procedures" book. Its pretty easy to grok.
and I havent done anything with the new load ballancing setup yet though. Its my understanding that the config is pretty much teh same as it is for 5.0. but you can specify HD space to use for the cache.