http://askubuntu.com/unanswered/tagged/?tab=mytags is my "go to" tab.

It either goes by your favorite tags that you've set, or if you haven't set any by the tags you've answered/been most active in and then sorts them by votes. You can start with the ones which are probably the most interesting by just going top to bottom on the page. 

I also use this screen to use up my daily votes, that is if I run into an answer with no votes that I feel is a good answer I vote on it. 

If I'm active that day and voting/answering heavily the list will change quickly, which is nice because it's always fresh and sorted by votes so I don't waste too much time with poorly voted questions.