There's also Ed's Junk, who's creating a pinball machine based on the old NBA Hangtime games.
Be sure to check out Ben Heck's pinball project as well at http://benheck.com.
And in case you missed it, Jeri Ellsworth is (was?) building a machine as well as other high-tech stuff I wouldn't dare trying to understand!
I'm pretty sure there's a lot more out that, let me know if you got a project going on - I would love to know about it. It always nice to see others honoring the past and show that pinball is just as great today as it ever was.