JPEG 2000, high quality.
Wow! That's really good. You can even still see the points on the Mail/Vienna badges.
JPEG 2000, medium quality.
Still great, but you can see some artifacts now. Look in the xterm, and at the top-left of the iTunes icon's CD.
JPEG 2000, low quality.
Noticeable artifacts now, and Vienna's badge has turned into a plain circle. Look also at the size box in OmniWeb's downloads window (just above the X11 icon). But on the whole, still not that bad.
JPEG 2000 Medium (unless you are crunched for bandwidth, in which case, Low)