A while back Ray Larabie started an interesting thread on Typophile regarding  accent collision lists, i.e. situations where an accent might collide with a neighboring character and thus represent a candidate for some font kerning. This problem is, of course, language- and script-specific, but this particular thread has a lot of useful information on problem cases in Latin script.

If anyone knows of similar references or discussions for other scripts, feel free to add a comment.