According to iTunes shop (UK) Grace Kelly was the most downloaded song of 2007 - congrats Mika!
Life in Cartoon Motion was the second most downloaded album of 2007:)
Here's the list and the link (in polish so you gotta trust my translation:P)
http://muzyka.onet.pl/10172,1656231,newsy.html
Singles:
1. Grace Kelly - Mika
2. Umbrella - Rihanna
3. How To Save A Life - The Fray
4. Ruby - Kaiser Chiefs
5. Hey There Delilah - Plain White T's
6. Stronger - Kanye West
7. Foundations - Kate Nash
8. Bleeding Love - Leona Lewis
9. About You Now - Sugababes
10. Shine - Take That
Albums:
1. Back to Black - Amy Winehouse
2. Life in Cartoon Motion - Mika
3. Favourite Worst Nightmare - Arctic Monkeys
4. Version - Mark Ronson
5. Hand Built by Robots - Newton Faulkner
6. Beautiful World - Take That
7. Echoes, Silence, Patience & Grace - Foo Fighters
8. Yours Truly, Angry Mob - Kaiser Chiefs
9. Eyes Open - Snow Patrol
10. Shock Value - Timbaland