Marling has already been introduced to a younger audience, in part due to her appearance at the Underage festival in London last year but the nomination will give her profile a boost in an older market.
Elsewhere, Neon Neon is the latest project by Super Furry Animals oddball-in-chief Gruff Rhys and producer Boom Bip, so is technically a debut album.
Neon Neon photo invaded by Har Mar Superstar (far-right)
Rhys was nominated with SFA in 2001 though, so he isn't a newcomer to the Mercury prize.
But the electronic pop of Neon is a different sound from the Celtic tinged Britpop of his former band.
They have the longest odds of 10/1.
Outside of debut albums, this could finally be the year for Radiohead, who have yet to win the prize.
They have missed just one Mercury nomination since 1997, and that was for 2000's challenging Kid A.
Their prior albums Pablo Honey and The Bends also missed out on the Mercury shortlist, despite including some of their classic tracks like Creep, High And Dry and Street Spirit.
Mercury debut winners
2007 Klaxons - Myths Of the Near Future
2006 Arctic Monkeys Whatever People Say I Am, That's What I'm Not
2004 Franz Ferdinand Franz Ferdinand
2003 Dizzee Rascal Boy in Da Corner
2002 Ms. Dynamite A Little Deeper
2000 Badly Drawn Boy The Hour of Bewilderbeast
1999 Talvin Singh Ok
1998 Gomez Bring It On
1995 Portishead Dummy
1993 Suede Suede
The judging panel described In Rainbows, which topped the US and UK charts, as Music that is adventurous, challenging and hugely enjoyable'.
Bookies William Hill have already made them joint favourites at 5-1 odds with The Last Shadow Puppets, who gain their first nomination.
Alex Turner has already tasted Mercury success with Arctic Monkeys when they picked up the £20,000 prize money for their 2006 debut Whatever People Say I Am, That's What I'm Not.
Turner's bandmate is close friend, Miles Kane, the lead singer from Liverpool indie band The Rascals.
While the Puppets' songs and lyrics are much more reflective of modern society, the Shadow Puppets have gone back to the string drenched 60s harmonies of The Walker Brothers for inspiration.
Elbow's fourth album, Seldom Seen Kid, is their biggest hit to date
The album's producer, Simian Mobile Disco's James Ford, produced last year's winners, Klaxons.
Guess what? It was their debut as well.
A hugely popular choice amongst music critics would be the fourth album by Elbow. They missed out on their debut nomination for their first album Asleep At the Back in 2001.
That year it went to PJ Harvey, by then on her sixth studio album and one of the only women to win the Mercury.
An impossibly beautiful album, The Seldom Seen Kid, is Elbow's highest charting record, breaking into the top five.
You can tune into BBC2 on 9 September to find out who will pick up the 2008 Mercury prize.
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