Chronologically would be starting with Bjork 1977.
That's not really advised =P
But yeah, Debut>Post>Telegram>Homogenic>Selmasongs>Verpsertine>Medulla
And somewhere in there, check out Gling Glo and the stuff she did with KUKL and Sugarcubes.
Sugarcubes albums are kind of... like a more whacked out version of the B-52's or something, but I like them a lot.