I wouldn't have a clue how to do this, but it would be nice to be able to import data from one install into another. I did this with 2 installs already (as 1 had little data) and it was a nightmare because I had to change all the topic numbers, post numbers, authors, etc. in the database manually.
There are a couple more databases that I wouldn't mind importing into one database and you can be sure that manually doing it isn't an option!
Thoughts,
Trent