Christophe has just posted on the Codeplex solution that allows easy handling of event handlers http://blogs.msdn.com/chrisfie/archive/2008/04/15/deploying-a-custom-event-handler-has-never-been-easier.aspx and I had my first chance to play with this yesterday. It made life so much easier! Please do take a look if you are working with server -side event handlers.
On a similar topic I have been working on event handlers that use impersonation to ensure that the event can get at the Project Server data in the right context - or use a specific user account to have the right permissions. I'll be posting that in the next few days. But for now - take a look at the Codeplex stuff.