Before I had Jared, I used to travel quite a bit. Outlook has a nice way of helping you keep the multiple timezones straight when you travel:

1. Tools | Options | Calendar Options
2. Time Zone
3. Click "Show an additional time zone", name it and select it

Then, when you're looking at your calendar, you will see two columns of the hours - one is your usual timezone, the second column is the one you just added. It's a quick way of reminding yourself what time it is at home for any meetings you schedule or are invited to.