It would be great to have these scripts online somewhere... I guess the seaside guys have a similar problem don't they?
No, Pharo images usually don't crash. At least not that often as Hudson does :-)
Hudson crashes all the time on my server too. I use daemontools as described in the Seaside book to keep it alive. There are various daemon watchers available that can restart your services so fast that you don't even notice they crashed. I guess that is standard procedure for many web application servers today.
Lukas