The Sefer Shmirat Halashon is IMHO one of the best organized s'farim in being "m'rakeiz" Talmud-Midrash-Zohar etc. On a single topic. I find this a definitive paradigm for combining machshavah on a single subject or group of related subjects.
How about a Sefer on issues of Business Ethics along the same lines? Combining statements about being honest - even to an eino-Y'hudi - and respect for property etc.? Prohibitions of g'neivas da'as, etc. Certainly the time has come for all of us to be more honest and introspective in our business dealings. A good book with ma'marei Hazal on the topic might inspire just such behaviour