[development] Node Types

I need to generate a list of active node types for a site, and I'm not sure how to go about doing that. What I need is an array something like this: $ntypes = array('blog','forum','flexi','page','story') The end result would be a list of possible node types a person would be able to subscribe to using the Subscriptions module. Any ideas how I might be able to find out which nodes are available for subscription? -- Dan Ziemecki Philosopher. Curmudgeon. Nerd.