Sorry to be a fuckwit, but I think any comparison to The Postal Service is about as superficial as saying eg. Motorhead are a dark Rolling Stones because they are both rock bands. OK, should've picked examples from a similar era, but you get what I'm talking about.
How do you think 'The Eraser' compares to The Notwist? To the last Dntel record, even? To Lali Puna? To Hood?
Anyone heard that newish Radiohead covers album? Maybe it's a Japan-only release. The R&B version of 'High & Dry' works really well, which makes lots of sense, really, bar the lyrics.