This is something I get caught out with from time to time.
You are not forced to reboot a Linux box as often as some other PC operating systems, for me this is good and bad.
It has been known for me to throw a machine together to solve a 'temporary' problem and not test that it returns to that same state after a reboot. It is all too easy to make the desired changes (iptables entries, NIC settings and routes) and not actually save them in init scripts. When your handy work silently turns from a 'temporary' solution into a permanent solution, and someone reboots the box... well you get the picture.
So if you can, always do a confidence reboot!
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