Maharsha Index

I was in a bookstore today and saw what I think is a new book - Me'oros Ha-Maharsha (I can't remember the author's name and, bizarrely, it has no publication date). It is a topical index, really a collection of excerpts indexed to topic, of the Maharsha's voluminous commentary to the Talmud. I did not buy it (this time) but it seems that a book like that is way overdue. It should make for some interesting and important studies into the Maharsha's worldview.