I like AmpetaDesk for a news aggregator but needed to fit more information onto the screen at one time, so I came up with a dynamic skin for it. All but the first line of each news item is rendered in a very tiny font, the first line is rendered normally. Click on each news item to expand it, click it again and it goes back to compressed form. The rest of the page re-flows seemlessly for each transition. All of this is possible using CSS and JavaScript. Don't try this with tables or a CMS ;-).
Works in NN6, Mozilla and IE6.
Download the skin here.