Doesn't really need any more explanation really, its all in the question
Mines Sweet Disposition -Temper Trap.

Has to be Empire Of The Sun - We Are The People for me! Havn't been able to stop listening to it since january!

I guess I might aswell pick one the majority have heard of. Lady GaGa's 'Just Dance'.

Got to be Ascendead Master by Versailles.

probably 'mykonos' by fleet foxes, or 'sleepyhead' by passion pit.

I'd go for White Lies- Death, or Muse- Uprising.

I agree OP, so far its Sweet Disposition by Temper Trap!

Probably, Zero- Yeah Yeah Yeahs or Fire by Kasabian.

Any of these :-

Get sexy Sugababes
Omen Prodigy
We are the people Empire of the Sun

Temporary Home - Carrie Underwood

Simply the best vocal of the year and co-written

http://www.youtube.com/watch?v=u-gPxqYV_zk

Temper Trap - Sweet Despostion love it!

Gotta be 'Happy' by Leona Lewis.

Blackout Crew - Rumper Pumper

Halo - Beyonce

Remedy - Little Boots

u2 - moments of surrender

Sexy Chick - David Guetta/Akon

Beyonce - Sweet Dreams

'Science of Fear' - Temper Trap
'At The Bottom' - Brand New

"Happy" - Leona
"Hello" - Eminem
"Half Mast" - Empire of the Sun
"Disappear" - Beyonce

Little Boots- Remedy
Little Boots- New In Town
Leona Lewis- Happy
Sugababes - Get Sexy
The Saturdays- Work
Lady Gaga- Pokerface
Lady Gaga- Paparazzi
Beyonce- Halo
Beyonce- Broken Hearted Girl
La Roux- Bulletproof
Mariah Carey- Obsessed
Black Eyed Peas- I Gotta Feeling

oops forgot

Rubber lover
Marmaduke Duke

How could I !?

Happy- Leona Lewis
Poker Face- Lady GaGa
Bad Romance- Lady GaGa

I don't exactly stay on top of new music, but...

Bat for Lashes - "Daniel"

Jay Z and Alesha Keys - Empire State Of Mind
Dizzee Rascal - Bonkers
Mistabishi - Printer Jam
Amanda Blank - A Love Song
JET - She's a Genius
Hockey - Too Fake
Biffy Clyro - The Captain
Simian Mobile Disco - Audacity Of Huge
Chase & Status ft Kano - Against All Odds (or was this last year?)
Kid British - Sunny Days
The View - One Off Pretender
Eminem - Beautiful
Arctic Monkeys - Cornerstone
MR Hudson - White Lies (rusko rmx)
The Prodigy - Invaders Must Die (+ all the album!)
Sub Focus - Rock It
Skint & Demoralised - Red Lipstick

I'd list many more but wouldn't want to bore you

Really good year for music imo