Wow, I never new there was so much interest in trip-hop!
I love all types of electronica but I really have been getting into trip-hop and similiar styles of music recently.
Apart from all the brilliant recommendations people have already made I do recommend the following:
Bent Their albums 'Programmed To Love', a 'The Everlasting Blink' and for me their latest and best, 'Ariels. I seriously can't stop listening to this stuff, kinda makes float into another dimension, amazing!
Mint Royale Similiar to bent, especially with theyr album 'Dancehall Places', excellent in my opinion.
Hexstatic I've only recently discovered their music and I'm currently listening to their album, 'Masterview' and I'm totally impressed. Very experimental style beats, the kinda music that puts a big grin on your face.
Theres so much more, alot of which has already been posted. I hope people keep this discussion going, as I really can't enough of this stuff.