Good beginner bodyweight routine(s)?

If you want body weight only, no weights or resistance bands, I'd suggest squats, lunges, push-ups (start with wall push-ups, then move to modified, the real ones), planks and pull-ups if you have access to a pull-up bar.

I'm using the Nike+Kinect, and I really like the results so far. It covers a lot of what Nerd Fitness suggests. I started with barely being able to do a single push-up (I've never had upper body strength), and I can now do multiples (still hard but getting easier). I can also plank a good long while now. Anyway, I recommend it if you have access to an Xbox/Kinect.