>>It would be neat if the "caption covering a progress bar could go "negative" wehen the bar moves on it - thats next weeks "sport" experiment.

That's exactly what the example I showed on the blog does. The progress indication % (caption covering the progress bar) changes color as the progressbar passes under it. I mean, if the progressbar is directly in the middle of it then "50%" will show half in red and half in white so that the user can see the caption. The caption doesn't have to be a percentage... it could be anything... "Copying data... One moment please." or whatever. Try out the example and you'll see.