Thanks to the Center for Japanese Studies Publications, The Three Jewels : a study and translation of Minamoto Tamenori's Sanbōe
by Edward B. Kamens is now available in its entirety online. I've loved Kamens' translation of the the Mahāsattva Jātaka for quite a while now, but it wasn't until recently that I discovered the treasure trove of a tome that it's part of...
A searchable web version: http://quod.lib.umich.edu/c/cjs/1077715.0001.001/--three-jewels-a-study-and-translation-of-minamoto-tamenoris?view=toc
The full book in PDF format: http://quod.lib.umich.edu/cgi/p/pod/dod-idx/three-jewels-a-study-and-translation-of-minamoto-tamenoris.pdf?c=cjs;idno=1077715.0001.001
From the Introduction:
"The Sutras, Tantras, and Philosophical Scriptures are great in number. However life is short, and intelligence is limited, so it's hard to cover them completely. You may know a lot, but if you don't put it into practice, it's like dying of thirst on the shore of a great lake. Likewise, it happens that a common corpse is found in the bed of a great scholar." ~ Karma Chagme དྲིན་ཆེན་རྗེ་བཙུན་བླ་མ་རཱ་ག་ཨ་སྱ་མཁྱེན་ནོ།