Copy pasta...

this should be possible at least in browsers like chrome. you can do it in gmail (in chrome) right now. 

if possible, it would be awesome. a lot of folks use imgur for screencaps and saving them and then uploading them makes very little sense if it can be made to work like suggested in modern browsers. a lot of people have already switched to firefox and chrome. 

The option to crop the screenshot would be nice of course.

I think the functionality you are talking about is like this. http://uploadscreenshot.com/  They use java, but it should be possible using HTML5

http://stackoverflow.com/questions/2008958/wysiwyg-with-image-copy-paste

this says that it currently isn't possible without java or flash, but afaik html5 allows it with canvas

Any news about this one? 

I wish they couls have in on ingur like there is on http://snag.gy/

As long as such functionality is not supported by the service itself, you can use this Greasemonkey script:

http://userscripts.org/scripts/show/125808

Right click copy shortcut/copy hyperlink paste into upload from web. This is already possible. Why would you want to printscreen?

Because sometimes you want to capture stupid shit on the net that isn't a picture, like this:

This feature is implemented and working for a few years already. Maybe this should be closed now.