Starting today, everyone can change their Minecraft account name. The technology for this has been ready for over a year, and now Mojang is finally doing it.
What does this mean for Calvin's servers? For the vanilla one, nothing. Your name will change, nothing else will be different. For the modded server, your inventory and location will stay the same, but you will lose stuff from Thaumcraft and Ars Magica. This can (should be able to) be fixed.
Simply, if you change your name, please email me with your previous name and new name. If you have played on the modded server, also say so.
If you have any questions, please ask.