If anyone is interested I just released a new version that contains an API for collecting any kind of data you want and to include it in the user interface, data files and even be able to send it via sockets to other tools. Of course you need to be a perl programmer to use it...
A second potential biggie, if you're a ganglia user, is you can now send any data collectl can collectl (which means hundreds of choices) directly to a gangila gmond.
see:
collectl
-mark