Carl Olson, at Insight Scoop, has a post with every link you could desire in regards to Obama and Notre Dame, but if he misses any, the Opinionated Catholic has it.
There is no lack of opinions on this matter, so here are a few I think are excellent:
-As is usually the case, Amy Welborn has good commentary here.
-Russ Shaw has three lessons we should learn from this flap.
-George Weigel hits another one out of the park with his comments.