Sheeri was also in Hämeenlinna for the OUGF Harmony conference a few weeks ago, and of course she had her video camera with her. My talk "Synchronous multi-master clusters with MySQL: an introduction to Galera" is now posted on Youtube. (You may also want to watch the slides on slideshare while listening.)
I think this is a really good talk if you are interested in Galera. First we cover how to get a Galera cluster running, including the most important options and status variables to pay attention to. I cover both the internal Galera architecture and how to use load balancers and clustering frameworks, and explain how galera handles node crashes and network partitioning.
Linas Varbalas from Continuent had the preceding talk (also on Youtube) so that's why there's so much talk about Tungsten every now and then. (I don't usually compare Tungsten and Galera a lot, but it was kind of fun, especially as it was a Finnish conference and both companies are born out of Helsinki.) All the really smart clustering questions are of course from Linas. (Any smart networking questions are from Petri Koistinen, who organizes the Helsinki MySQL UG.)
There's one correction to make: Recent versions of Galera actually allow you to specify multiple gcomm:// URL connection strings using the wsrep_urls option. I had somehow managed to forget this when doing the talk (a year ago Alex was always explaining that implementing that would be a bad idea :-)
A few days ago Jay Janssen from Percona also gave a great webinar about Galera: Migrating to Percona XtraDB Cluster. It was a very good webinar, also worth watching. (Yeah, guess how I remembered about wsrep_urls option...)