Steve has been playing with the Everun for a few day already and today he posted a long video all dedicated about performance.
YouTube works if you knock the video size down on the in-line player. iTunes installs and works for any download but fails on video playback. Powerpoint presentations should be OK. Word 2003 was quick to start up and operate, and the common Google Internet applications (iGoogle, GMail, Google Reader) work well. (Reader is a dream with the keyboard.) The Big Plus though is DivX. Amazing performance. I never expected this 600Mhz device to turn in the quality that I saw.
Vega was not either a "high performance" machine. Both, Vega and Everun are all about convenience.