Does anybody else use this manual grammar for NT Greek?
I bought it only because I found a cheap used copy, and I found the descriptions surprisingly clear and illuminating. I find myself turning to it even when reading Homer, if I need to refresh myself about the functions of cases and tenses.
Also, Rodney Decker's website has many useful pdf files that he posted for his classes. There are several diagramed sentences from the NT that I found enlightening; I found it so helpful that I started trying to diagram sentences myself. There are other great resources there worth browsing through.