NASA SLI Program narrows down the field to 15.
From the SLI web page. Click on the news link.
What's really depressing is that some of these "new" ideas--a winged orbiter on a winged booster--are what was promised for the Shuttle back in the '70s.
Checked out some of the pictures here. Holy cats. Some of these look like someone dumped glue into a box of model airplane parts and shook it. The concept of "kludge" has been raised to a whole new level.
A few of them look disturbingly like some sort of perverted airplane orgy.