Sliderocket is a new web based presentation creation tool. The site is currently in private beta, i grabbed an invite yesterday, Thanks to TechCrunch. SlideRocket is really impressive tool built in flash.
With sliderocket you can create presentations, share with others, collaborate with colleagues. Creating presentations is easy, the interface is nice and slick. You can add videos, images, flash, charts, clip art etc. Flickr and Yahoo image search is integrated so that you can pull photos from Flickr, you can also search only CC licensed photos for your presentations.
It allows you to import your existing presentations. The most impressive part is it supports some nice transition effects. Presentations can be shared with others by embed or by sending email.