There's a good article up at http://www.popmatters.com/pm/review/love-story. It summarizes much of what the movie is about: Arthur Lee's early days in Tennesee, Love getting picked up by Electra's Jack Holzman, Lee's genius (Holzman says Lee is one of the few geniuses he's ever met), Lee's helping of a then unknown singer named Jim Morrison, the factors contributing to Love's (and Lee's) lack of popularity: the refusal to tour outside of LA, the band's increasing addiction to heroin, Lee's tendency to isolate--and how it was possible at all for a band plagued with such problems, could hardly function from being so strung out--how could they make an album that has hit every Best Of list, as well as being a contender for best rock album ever made!
Also, Lee's second solo album that was never released--Black Beauty--has been released a few months ago. Some say it would have marked a strong comeback had Lee released it back in '73. It has a very R&B sound, definitely the direction Lee was going in after Forever Changes. And let it be said that Four Sail is a great classic itself, although with a different band and a heavier guitar sound from Jay Donnelen. The only other album I might put in the same category as Forever Changes would be The Twelve Dreams of Dr. Sardonicus by Spirit. But don't get me started.