For a range of screenshots from different uses of NXT see the Butterfly Collection.
NXT has been used on a number of data sets both large and small. This is a list of some of them:
The one-meeting samples, other than Switchboard, include media files. To use them make sure you have downloaded NXT, then unzip them into your NXT root directory and click on the appropriate startup script for your platform. Note: if you unzip in the wrong location, the startup scripts may not work.
We have a fairly fluid schedule for future work depending on our supporting projects and the bug-list and feature requests at the NXT SourceForge page