Are there any Craft specific migration tools that extend Yii's built-in functionality? We're working on developing a proper deployment system for projects built on Craft, and wondering if there are any Craft specific tools built-in that can assist with generating database migrations, other than those included with Yii itself?

I have more questions, but we'll start here.
Craft has it's own version of Yii's console app, yiic, in craft/app/etc/console/yiic.php and we have a migrate command that lets you create, view history, see new migrations, etc. for plugins as well as Craft itself.

We've extended the default migrate command to add Craft-specific features and remove some default Yii functionality that we don't want to support (i.e. down migrations).

You can see the available commands to run here: http://buildwithcraft.com/docs/plugins/migrations