John, I thought we agreed that DPI doesn't matter for web purposes... http://www.talkgraphics.com/images/smilies/tongue.gif The DPI sampling only makes a difference when printing an image.

WR1000 - an 800 by 600 pixel image will fill up the (PC) browser window (plus a little bit more, because of scroll bar and navigation) if the user is running at 800 by 600 screen resolution. The image will "fit" better with more screen real estate.

If you think in pixels you will know exactly how your image will appear on any screen.

As John said, minimizing the number of colours will help make GIFs smaller. As for the compression of JPGs and 70% - it depends on the application (40% is the lower end of medium on photoshop for instance, and works great for many files) and the type (content) of file. You have to play around with it...

When working (exporting) purely photographic images from Xara X - pull down the antialiasing before exporting to prevent the images from becoming to soft (blurry).