My first contribution to Wiki was on June 26, 2005 on the Minamisanriku merger in Miyagi prefecture, Japan. Unfortunately, I hadn't opened a Wiki account before doing so, and the change history shows my IP address instead of my user name.
I use a 15" PowerBook G4. I've been a long-time Windows user, and I just switched to Mac before going to Japan. I hope my decision turns out well, along with my JET Program adventure.