Ways to upload to imgur include clicking upload button, using file dialog; dragging and dropping onto the webpage; OSX dashboard widget (used this one when I was on mac); windows context menu (right click send to imgur); chrome extension; FF extension; bash script; wordpress plugin... basically any way you can think of, you can put images on imgur quickly. Oh and not blocking 3rd party referrers, and actually doing a good job of handling images makes a big difference. To the latter point: I was uploading images from iOS to wordpress but the orientation was in the EXIF data. WP ignored this so my images were rotated the wrong way... use `convert` to fix them 1x1 = pain in the ass. Select images, drag/drop onto desktop, group as album... surprise surprise: imgur orients the pictures properly automatically.
The UX on imgur is what I'd call a case study of good UX, basically the best I've seen on any website. Kudos to imgur, they deserve all the success they're getting. /fanrant