I like this notion of the desktop metaphor being extended to bookmarks. Actually I was quite disappointed to see that Google missed this trick with their new Chromebooks, preferring to stuff app links into a bar at the bottom of their desktop. Your approach makes a lot more sense.

Quick bug report, there is a display issue when one's browser window (or screen) isn't wide enough, it chops off whatever is meant to be at the right hand side at the top: http://i.imgur.com/GfNtJcv.png

Another issue is that sub-memorypools with identical names can be created. Not sure if that is intentional or not.

Also a suggestion, I think that dragging a bookmark icon on top of a memorypool icon should move it into there.