[ses]

This seems like a good idea, with decent gmail integration. It's certainly one of the best approaches to the meeting 'time slot suggestion' problem I've seen so far. I developed a product (meetingShed http://www.meetingshed.com) which aims to solve the meeting scheduling problem from another angle - using people's Google calendar data by a sharing mechanism so you don't have to send messages back and forth between people. There's advantages and disadvantages of both approaches, but this is definately an interesting implementation.