I think it is a great idea. Ideally, you would be able to tag a part of a note as an action to go into one particular action list. For example, you may have personal actions, work actions etc. You may also have actions you want to assign to others which would be great to be able to do via Evernote.
This would make note taking in meetings using evernote MUCH more powerful. As it stands, I have about 10 active projects and regularly make notes in these notebooks or one of numerous others. Any actions in these notes can be very hard to find and therefore to check whether they have been done.