I just ran across Bruce Terry's "A Student's Guide to New Testament Textual Variants" at
ovc.edu/terry/tc/index.htm . If something similar could be done for Hebrew, I think it would be useful. I realize that the available texts are much different. For masoretic texts, presumably including all scrolls used today by Jewish believers, the differences would be comparatively much fewer; including DSS and possibly even some Septuagint and Samaritan readings would make it a huge undertaking.