Database for a Web Site like Java Ranch

Hi,
This question to creater's of this site.
Do you use any RDBMS to store the data of this site or due to use the flat files.
Are you hosted in any ISP or you have your own box.
I will grateful if you could answer me, so that i can decide on how to best implement my site.
Cheers
Vijay

Flat files and hosted.
I thought about doing my own box but was worried about net problems. This way, the host has to worry about net problems. Lots of times they have the problem fixed before I find out there was even a problem.

Cheers Paul,
Have you designed and developed these mailgroups yourself or they are ready made off the shelves. I mean if you have done this yourself, how much time did take you???
Is it written in java???

Nope - I didn't write this stuff. The current stuff is in Perl, but the company that makes it is releasing a Java version soon.