BUG: Small images are no longer being properly cropped square Answered
It looks like an update was rolled out overnight. In the Instructables browsing pages, the word "featured" has been replaced with "editor's picks". Obviously, the underlying URL is the same (since it uses a database keyword). This change hasn't been done in either the forum topics or Questions areas.
There's also a bug in the I'bles browsing. Instead of pictures being centered to fit in the same sized thumbnail on each image, smaller images now take up less space. This creates problems with sideshow or video labels, as you can see below.
UPDATE 10 Nov 2010: The bug is not in the page browsing, but rather in the image library system. The three "square" image versions, TINY, SQUARE, and SQUARE2, are no longer being cropped properly to have equal height and width. Instead, they are simply reduced in size from the original, but keeping the full image's aspect ratio.
UPDATE 14 Nov 2010: Another user has reported noticing that their step-by-step icon images are different sizes. This is the same bug, as the TINY version is what is used for the step icons.
UPDATE 17 Nov 2010: Well, the cropping seems to be back to square, but instead of the small images being scaled to the right size before cropping, little chunks are just being taken from the middle. For large, high resolution images, the result is a blurry bit of abstract art.