SSL stuff

Oh, lookie. Another one of those concept questions that you all pay no attention to.

I noticed that SSL came up in the mu forums again. Gotta admit that I think it's a good idea. Has anyone tried this yet? This link was given and I'm sitting here looking at it:

I know I would just do the signup and login pages as suggested and leave the wp-admin subdirectory alone. The long history of all of the problems had with SSL may come back to haunt you otherwise.

I see a mention that SSL support is now "built in" Have to admit that's news to me. Is the built in support worth it? Is there an easy way to turn it on or should we go the plugin route?