I collect a lot of rad WordPress plugins (don’t believe me? Check it out below, foo’!), but if there is ONE WP plugin you MUST install NOW, then it is WordPress Backup. If you are doubting me on this, go read this and this from one of the bigger bloggers in the tech world.
So, if you don’t want to lose your blog, or site (lots of sites being built on WordPress!), and rely on Twitter (*shudder*) and RSS to rebuild your site, get the plugin (it’s free) now, and schedule daily backups.
I have backed up all my sites and sent the backups to an email for all of them.