I've been following this guy's (Frater R.O) blog for several weeks now and he finally finished up a medium-sized work on Goetic magick. Now I can't vouche for the contents as I haven't been able to purchase either of his grimoires (he also has a Modern Angelic Grimoire) however through my various readings of his blog I think they are prolly worth a read and will purchase them when able. Anywho I felt I should share this so here's the link to his site which currently has the Table of Contents to the Modern Goetic Grimoire as the most recent post:
http://headforred.blogspot.com/