So !bangs are awesome, but it'd be cool if there was some documentation to say what the most common ones do. Or maybe just a table that lists the URL each !bang points to so you can find the one you want more easily?
Also, I can't help but noticing that all the search results redirect through DDG's servers. I understand this is to protect the privacy of those with the HTTP referer field enabled, but could you make a !bang to disable this? This would (a) make it possible to copy a search result without having to follow the hyperlink and (b) allow those with HTTP referer disabled to be more certain that they aren't being tracked.