CorePlayer 1.0 is Fantastic!!!!
I just installed CorePlayer 1.0 on the Treo 700w, and I am thoroughly impressed. I do not remember being so excited about new software since VisiCalc was released for the Apple II. CorePlayer allows playback of multi-formatted video clips, including mov, avi, mp4, and H264 clips. Video netcasts formatted for an iPod played back flawlessly, as well as avi and wmv clips formatted for Windows Media Player. I tried the movies created by three digital cameras, and all played back well on the Treo directly off the SD cards from the cameras. It is so nice to have one player that can play almost all the video clips I encounter regardless of format and/or container. The application seems extremely stable for a 1.0 release.

I assume future versions will support even more codecs; however, my experience is that CorePlayer 1.0 supports the bulk of the formats you probably would encounter.

I highly recommend that anyone interested in video playback on their Treo or other Windows Mobile device seriously consider CorePlayer 1.0.  ¶ 2:40 AM