So if you're diggin' Portishead, I've got another band to send your way: The Atomica Project. TAP is headed up by a female vocalist, Lauren Cheatham, with a voice much like Beth Gibbon's, perhaps a little warmer. They've also got that feeling of cinematic largeness which sometimes spreads wide behind her vocals and at other times dwindles down to a dark note. Taken as a whole, the album (it's titled Grayscale and it's the band's second) feels like the positive inverse of Third. It still has its melancholy moments of tender expression, but in general it employs some brighter instrumental components that lighten it up somewhat.
Both albums are available now, so pick them up and listen to your dark heart's content.