Watch http://www.imdb.com/title/tt0067525/. It's the same move (from 1971). . .but good.
Wow, I just found a copy of The Omega Man (1971) starring Charlton Heston at the grocery store for $5.00!
I've never, ever seen it before, and am looking forward to checking it out later tonight.
I've always heard of it but never knew it was based on "I Am Legend".
I searched it out here because I thought that it had been previously mentioned in one of these threads talking about post-apocalyptic movies....
Can't wait...