A guy in a group I belonged to asked me what angelic grimoire I used. The only ones I really know of are the Ars Almadel, the Ars Paulina, and, if you stretch the idea a bit, the Art of drawing spirits into Crystals. The Shemhamephoresh angels I really don't understand, the Enochian system is a complete system, not really a grimoire per se, and the Ophanim system based on Jacob's Wheel is way over my head.
So I'm thinking, you know, most of these grimoires are considered hard to understand. They're written in Middle English, at best, and have strange requirements, and somewhat confusing directions. You have to flip around to different resources to get the images you need. There's no single resource available that you can just open and have a complete grimoire, a manual of contacting the angels in easy to read and follow steps.
So, I've decided to write one. I'll have to research the copyright issues, and talk to the webmasters of the sources I'd be using, but I think I'll be able to throw together a decent Modern Angelic Grimoire. Writing user guides is what I do, after all.
If you're interested in a copy, let me know.