Then there's (in a more lowbrow vein):
Regatta de Blanc - The Police
Actually - The Pet Shop Boys
Men and Women - Simply Red
Led Zeppelin II
All far more memorable (and in most cases more commercially successful) than the first album.
Having said that, for budgetary reasons first albums often do have a really appealing raw, immediate, pared down feel (U2's first album springs to mind) that often gets lost once the band have more money to throw at an album.
Right, I'm getting far too serious for a random thread, so I'll bog off now.