They definitely do have a labyrinth of a discography, as both FSOL and Amorphous Androgynous. It's well worth getting into piece by piece though. I go about such things like so...
The Future Sound of London รข€“ Discover music, videos, concerts, & pictures at Last.fm
^ The top albums section is usually a fail-safe way to get into a new artist from the top downwards if you will. There's a link to Amorphous Androgynous' page there as well which is well worth a look.
I'm just listening to AA's Alice In Ultraland at the moment. There's some bloody amazing, brain-melting neo-psychedelia/down-tempo going on here.