How do I open two/multiple fullscreen views simultaneously in 10.7 Lion?
Unfortunately, you can't. I am hoping Apple will fix this as soon as possible as well.

There's a trick where you can put some app in the fabric space, as documented in OS X hints.


  However, if you utilize the full-screen swipe gesture to move to a separate full screen and pause/stop in the middle with multiple Spaces in view and invoke another application (i.e. via Spotlight), the spawned application can reside in the 'fabric space' or anywhere else. It basically remains attached to that space.