AJAX applications essentially minimize 'browser flash' by loading the UI into a single web page and then update the page behind the scenes obtaining XML data from the web. Google has developed a lot of these applications of late like G-Mail and Google Maps.
While the prototype was far off from a real application, it piqued Dow Jones interest and led to follow-on work developing Offline (yes Offline!) browser-based trading applications (one for Commercial Paper, the other for ForEx). I know what you're thinking - why would anyone need an offline browser-based application? Well back in 1997, many companies didn't have broadband, and wanted to work offline before dialing up and syncing. With some of my colleagues, we developed a local browser app that could save data to an MS access database and then synchronize when connected. I wonder if anyone is doing that with AJAX? :)
Unfortunately, Bridge Information Systems bought Telerate from Dow Jones while the project was in development, and sadly, it never got launched. Maybe I will develop an AJAX app - if not for anything else, than for old times' sake :)