Doodle: Scheduling meetings

This has been mentioned here before (just in comments, I think), but I have to repeat: I can't say enough good things about Doodle. It takes the idiotically over-complicated problem of figuring out when all of n people are available to do something, and in the simplest way conceivable, polls all the participants to find the optimal time and date.

I'm always thrilled when colleagues send a meeting invite in the form of a Doodle email; it requires zero fiddling on my part and pleasantly skirts the need for the endless email threads that most people rely on to get a group of people extant in one time-space unit.

I'm risking the indignity of a double-post on an "old" link for a good reason: with all the foam and fuss over "Web 2.0," and the ever higher (Ever! Higher!) technology we shovel to solve stupid human problems, it's refreshing to see adoption of a tool that ends up being no more complicated than a white board with electrical-tape columns.

I wish stuff like Doodle would inspire more developers to start with the Simplest Thing That Could Possibly Work. No Arial Rounded, no whizzy AJAX, and no angel-round-attracting gradients. Just a modest solution to a single dumb problem. That is a life hack, defined.

What's your favorite idiotically simple web tool right now?