There are some pretty cool new ride concepts coming out from manufacturers at the IAAPA Expo at Orlando this year. Some are a Launched Wooden coaster, a waterslide inside a waterslide, coadter wheels with LEDs, S&S Power's 4-across trains, and much more. Theme Park Review seems to be documenting their discoveries pretty constant today:
http://www.themeparkreview.com/forum/viewtopic.php?f=2&t=57455&start=20
http://www.themeparkreview.com/forum/viewtopic.php?f=2&t=57455&start=20