Idea: My Free Time
Everyone is always asking me what times I have free to meet for various functions. Every time this happens I have to search through my Google Calendar looking for blocks of time that might fit the bill. I think it would be great to have a Gcal feature or web extension that would do this dirty work for you.
How it would work: you would just select a date range (or default the current week) and a time duration, and specify the email address of the person you want to inform of your available meeting times. They then get sent a Gcal version of your calendar with the available times blocked out. The recipient can then select one of these time slots (by clicking on it in the email), and both your calendar (and theirs if they’re using Gcal) are automatically updated. I guess this is somewhat like publishing your free/busy data, but more specific to individual requests of your availability and useful when the folks requesting your availability are still tied to Outlook.