Gnarls Barkley's song Crazy has been confirmed as the biggest selling single of 2006.
Gnarls Barkley's single Crazy has been widely hailed as a classic
The track, which was the first to reach number one on downloads alone, held off the challenge of X-factor winner Leona.
Snow Patrol's album Eyes Open topped the album chart with estimated sales of 1.5m while Take That's comeback release Beautiful World came in just behind.
Singles sales have doubled to over 65m since the download chart was launched in September 2004.
Crazy took advantage of a March 2006 change in the chart rules which allowed downloads to count to chart position a week before a physical format was released.
TOP FIVE ALBUMS
1. Eyes Open - Snow Patrol
2. Beautiful World - Take That
3. Ta-Dah - Scissor Sisters
4. Whatever People Say I Am That's What I'm Not - Arctic Monkeys
5. Inside In / Inside Out - Kooks
It sold over 30,000 copies in that first week and stayed at number one for nine weeks.
Although final figures are yet to be released, it is estimated the song sold over 700,000 copies.
X-Factor winner Leona Lewis's A Moment Like This sold almost 100,000 downloads in just two days, scoring a runaway Christmas number one and reportedly outselling the rest of the top 20 put together.
In the album chart, Snow Patrol's fourth album, Eyes Open, which was released in May, made it to the top spot on three separate occasions.
Take That's Beautiful World, their first new album for over 10 years, stormed past the million sales mark in just four weeks but failed to beat Snow Patrol by the 31 December deadline.
TOP FIVE SINGLES
Crazy - Gnarls Barkley
A Moment Like This - Leona Lewis
Hips Don't Lie - Shakira Ft Wyclef Jean
I Don't Feel Like Dancin' - Scissor Sisters
I Wish I Was a Punk Rocker - Sandi Thom
Recorded sales of singles had slumped by more than 50% since the late 1990s before the decision to add downloads to the singles charts.
Legal downloads rose from 5.8 million in 2004 to over 50 million in 2006 and now account for 60% of the overall market and 80% of back catalogue sales.
From the beginning of 2007 downloaded singles and album tracks that are not supported by a physical format will count towards the chart.