Actually if you have a websocket enabled browser questions are pushed to your tag.
So i usually have http://stackoverflow.com/questions/tagged/jquery and
http://stackoverflow.com/questions/tagged/php open and they auto refresh.
When a new question pops out i open that in a new tab.
Then I give a really quick read and I decide if the question is easy (can I answer it in less than one minute) or more complex. I answer the easy questions straight away and save the more complex ones for a later (and more in-depth answer).