Even though we have search capabilities in Logos, I imagine this would be useful for finding topics and themes that aren't easily defined by search terms unless you already know the Talmud well enough to know what you're searching for (which I'm guessing most of us don't [:)]):
• HaMafteach. The English volume by subject may be enough for now.
(Ignore the $100-150/volume second hand prices you might see at Amazon. These seem to be due to the fact that the publisher released a tiny 2,000 copy first edition to test the waters, which was snatched up in days, so until enough books are printed to cover the immediate demand it's the sellers' market. According to a NYT article on the project, the real prices are more like $29.99 for the first English and $24.99 for the first Hebrew volume, which sounds considerably more attractive.)
With complete linking to the Talmud, this is also probably the kind of work that could attract a large number of new Jewish users to Logos, especially if a Jewish base package was introduced as well.
The great question, of course, is if the publisher is too Orthodox to consider working with a Christian counterpart.