What is the best user interface you've ever used? One that made doing your task a pleasure, that was perfectly designed for the task it was intended for and facilitated doing it with ease. One that made you want to somehow locate the creators over the internet, personally fly to their location, and then hand them a large pile of money.
What made it so great? Was it simplicity, unobtrusiveness? Screenshots are a plus.
Related question: Worst UI Ever.
Update 8/12/2010 9:55am: Speaking of this question potentially being "confrontational", here are the most controversial answers, where "controversy" is defined as
(1 - (# down votes / # up votes)). 0 would be most controversial with an even ratio (equal number of people hate it and love it). I also included the total number of votes so you could see how 'hot' the topic really is:
- vim: 0.7, 52 total votes
- Unix shell: 0.716, 131 total votes
- Mac OS X: 0.719, 187 total votes
- Smith & Wesson 357 Mag: 0.723, 83 total votes
- Total Commander: 0.724, 37 total votes
What can we all agree on?
- Half-Life Weapon Selector: 1.0, 19 total votes (unanimous agreement of awesomeness)
- textmate/e: 1.0, 25 total votes (must be a great editor... or not well-known... or both)
- uTorrent: 0.973, 115 total votes
- Tortoise SVN: 0.95, 43 total votes
- GMail: 0.949, 247 total votes
I should add this is biased to the higher-scoring ones, or ones with a lot of votes. For example, Facebook is probably most controversial by far (0.2), but it only has 11 total votes, so that's probably not representative enough. Also people probably upvote more than they downvote anyway, so maybe the ratio should be different. But this isn't a scientific experiment anyway =).