I often hear people say things like - DNN uses the database too much, DNN is slow for a big site.  Rarely is there any actual evidence - it's all based on blind prejudice.

I'd like to know what hardware this site runs on.  Then I'd have an existence argument giving a ballpark on how much hardware you need to run a site with half a million plus registered users.  Yes - I know there is no real evidence of how much the users do on the site, although the front page does give a clue about how many users are currenly using the site.

Sebastian - Thanks very much for the information. 

Do you know anything about the specificatyion for these machines?  Are they monster machines, or babies?

We have not moved DotNetNuke.com into the farm yet.  That will happen with the upcoming release. 

We currently run on a single dual Zeon (2.4 Ghz) box with 2Gb of memory.  We have a separate database server with SQL Server 2005 - quad pentium at 1.4 Ghz with 4Gb memory.  None of our machines are cutting edge by any stretch.