I switched from Pocket/Read it later ages ago when instapaper started supporting Kindle deliver. I use it all the time and at some points, its been the main reason for having my paperwhite kindle. The nice thing is its pretty much automatic, and I tend to just turn the kindle on and it automatically gets the latest instapaper over wifi.
I side stepped the Kindle’s annotation system by having the same document on my phone and being able tweet it directly. Its all pretty great, although I did consider using diigo’s readitlater feature, especially now the mobile app is better.
However I have wanted a solution for saving non youtube videos (I use watch later for youtube at the moment). The amount of times someones posted a video to Vimeo and I have had to bookmark it or something else.
Well it seems somewhere in the updates, they added support for video from youtube and vimeo! Great stuff my pro payment is well spent, not only that the ifttt channel has been updated with a number of improvements, but I really need to start using the highlights/annotation feature more.