I'm looking for the same sort of thing. After I posted to this group 
last week I found a module for apache (assuming this is what you're 
using) called mod_backhand. You can set up multiple web servers that 
will do load balancing and should pick up the slack if one (or more 
machines) does crash.

http://www.backhand.org/mod_backhand/
http://www.backhand.org/ApacheCon2001/US/backhand_course_notes.pdf

Email I haven't looked at yet.

Hope this helps.

craig.


Konrad Neuwirth wrote:
> Hi everyone,
> 
>   I'm currently looking for solutions to have a failover scenario for,
> basically, web and email services.  I've found a few questions
> regarding freevrrp for NetBSD but, alas, no helpful answer so far.
> 
>   Is anybody willing to share his experiences with such a setup or
> helpful hints on how to go about with this? 
> 
> Thanks,
>  Konrad