This one isn’t directly connected to running a server, but it’s incredibly useful for those that are on the move quite often. (And those who are on the move quite often usually have servers, so there’s my justification.)
Most of my internet time is spent at my house, my office, or the data center. In all three places I have static ip’s for port forwarding, etc. For each spot, I have a “Location” setup on my MacBook Air. I got tired of manually changing the location each time I moved around so I went searching and I found Locamatic.
Locamatic is a preference pane that will automatically change your Location based on whatever network your Airport card joins.
I’ve had it setup for a week now and it’s worked flawlessly switching me between locations.
If this sounds useful, you can it here for free.