Rob sent round a really relevant link for us

http://daptivate.com/archive/2008/02/12/top-10-best-practices-for-production-asp-net-applications.aspx

it contains 10 points to look at before setting your .net apps live and there are some really good points in there.  Things like encryption key changes between live and development servers might be a bit overkill but there were some i never knew about, like changing the machine.config compilation tag to enable somethign called "Retail Mode".  That said, sometimes we host multiple sites on the the same server and the machine.config is a machine-wide settings store but it cetaintly points you in the right direction :¬)

The only one i was a bit sketchy about is the stress testing one as i haven't had very good experiences of stress test applications.  The last one i used would only install on windows XP so it was pretty old school but there must be some newer ones out by now.

I'll have a dig around and see what i can find