There is a three page WebmasterWorld thread with people reporting that many sites are having indexing issues in Yahoo! Search. Basically what is being reported is that the listing in Yahoo are only displaying the URLs and nothing more, such as page title or page description.
I do not have any specific examples to share, I am sorry. But the thread is currently three pages long.
There are other reports at DigitalPoint Forums also.
Forum discussion at WebmasterWorld & DigitalPoint Forums.
