The Data View web part is the most powerfull web part that ships with WSS but in v2 it would render all items in the data source in FrontPage designer view. This used to be a real pain when there were hundreds or thousands of records.
Now you have control over how the DVWP previews data at design time.
I was just fixing up my list/details page so that I could use it for another project I’m working on and it really helps when you have multiple connected web parts on the page.
Demo
http://www.wssdemo.com/Pages/Lists.aspx
While we are on the subject of Web Part Pages, anyone else notice that it takes a lot more clicks and screen refreshes to build a web part page with more than one web part on the page?