Just to prove there are a million ways to get something done I decided to try using the jQuery clueTip Plugin to provide more details about an item in an ASP.NET ListView via a popup.

Demo | Download

 
Note: I know the addresses are incomplete but you get the idea.

The plugin is dead simple to use. All you really need after adding the required scripts to your project is the following jQuery:

$('a.title').cluetip({splitTitle: '|'});

Of course there are a million ways to customize the popup via the script/css. For more details take a look at the clueTip examples page.