As to another aspect of compressing pics for the web: Preserving your control of the image from image thieves. If you tend to put up large dimensioned, high-quality pics, they get stolen faster (or bandwidth-robbed) more than the smaller, lower-quality pics. Do you want to see that beauty of a VIATWAS you just spent three weeks on plastered all over the net with someone else's name slapped on it? The net should be a place to display your work, yes, but not a place where it can be stolen easily.

RosemaryR
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"This...this is magnificent!"
"Oh, yeah. Ooooo. Aaaaah. That's how it starts.
Then, later, there's ...running. And....screaming."