Over the last few months, I've seen a surprising number of time-related extensions popping up in our gallery - timers, stopwatches, countdowns, and the like. I think it's because 1) many people use Wave to interact with folks from different timezones, and 2) many people use Wave during meetings... and many people don't like meetings to go over time . :) Whatever the reasons may be, it's a good thing for all of us, as these extensions come in handy in a variety of situations. For example, the Remaining Time gadget is a favorite of mine. Its simple interface lets you specify an event name and an event time, and then it countdowns to that time. We first used this gadget in the Google I/O 2010 conference session waves to show the countdown until the start of the talk. We did this because many developers were eager to watch the live notes for a session from afar, but they couldn't easily convert from the San Francisco time listed into their own local time.…