Just approved on BGG:
Its a spreadsheet (available in both .ods and .xls format) giving all sorts of information regarding what you can encounter in both locations on Earth and Other Worlds. For instance, what % of the encounters are "Good", "Bad", or "Mixed"; what's the chance that you may end up losing sanity; etc.
What makes this unique is that it includes info from ALL the expansions (including Innsmouth). By changing some values on the first sheet you can indicate what expansions you are using and the information updates immediately.
Warning: This can be considered to be a MAJOR cheat sheet - if you are new to the game you will lose the thrill (agony?) of learning where the high frequency gates are located at. None the less, I find it useful since it reminds me, for example, that if I'm going to R'lyeh that I might want to make sure that my investigators Speed is at max, since no matter what expansions are used, the most common skill check is for speed.