Scott - the reasons why so many people including myself know that the Kate Nash Album is brilliant even though it's not out are obvious:
1. they have seen her live (inc Glasto, T in The Park etc)
2. they have seen her on You Tube - all the album tracks have (legally) been on there for weeks
3. they have listened to her sessions on the radio e.g. XFM
4. they view her MySpace site which actually kick started her fame (check out the 1.3 million+ hits figure).
I think the album is highly original, nothing like Lily Allen, thankfully sung in her own voice (not a pseudo American one) and I am off to see her at two gigs in Sept and Nov.
I hope you revise your opinion and enjoy the album.