What would yours be?

For me there are loads but Girls Aloud 'Call The Shots' is a strong contender...

I'd probably go for Rachel Stevens - Some Girls

But honourable mentions go to:

Annie - Chewing Gum
Sugababes - Push The Button
Girls Aloud - Biology
Britney Spears - Toxic

For me it's gotta be out of.....

Beyoncé - Crazy In Love
Leona Lewis - Bleeding Love
Rihanna - Umbrella

I can't really pick.

Vanessa Carlton - A Thousand Miles

Perfect pop song.

Gnarls Barkley - Crazy.
Kylie - Can't Get You Out of My Head.
Britney - Toxic.
Madonna - Hung Up.
Rihanna - Umbrella.
Gaga - Bad Romance.

There are a lot, really. I'd definitely buy the best of the noughty decade album.

Rihanna - Umbrella, Don't Stop the Music, Only Girl
Beyonce - Single Ladies
Brintey Spears - Toxic
Rachel Stevens - Some Girls (Thanks forgot about that one)
Lady Gaga - Just Dance
Pink - Get the Party Started
Madonna - Hung Up
Justin Timberlake - Sexyback
Kylie - Can't Get You Outta My Head
Black Eyed Peas (I Gotta Feeling)

It's funny how most are from the past 3-4 years. Not the best decade me thinks.

This. I'd also add Girls Alouds' 'Biology' to the list

Sam Sparro - Black and Gold (and the Gold remix version).

Classic pop song.

Outkast 'Hey Ya!' by a country mile.

Britney - Toxic
Justin Timberlake - Sexy Back

But I still think Nelly Furtado - Maneater - takes some beating.

Wholeheartedly agree

blimey that's a hard one!!

crazy in love i like...

bad romance?

that daniel powter song did well too...

Crazy In Love - Beyonce
Umbrella - Rhianna
Just Dance - Gaga
Can't Get You Out Of My Head - Kylie
Toxic - Britney
Somebody Told Me - The Killers
Crazy - Gnarls Barkley
Gay Bar - Electric Six (:P)
Where Is The Love? - Black Eyed Peas
Rule The World - Take That
You're Beautiful - James Blunt
Run - Snow Patrol
Feel - Robbie Williams

Quite a few Pink and Girls Aloud songs as well. Of course, tons and tons I can't think of just now.

Biology - Girls Aloud

Biology and Untouchable (origional version)

My list would look something like this
Heartbeat - Annie
Acapella - Kelis
Call The Shots - Girls Aloud
Freak Like Me - Sugababes
Sweet About Me - Gabriella Cilmi
Foundations - Kate Nash
Golden Skanks - Klaxons
Human - The Killers
Say It Right - Nelly Furtado

So pleased to see the ridiculously-underrated Annie getting mentioned in this thread!

Umbrella ella ella eh eh eh eh

Angel City - Sunrise

The Saturdays - Higher

by faaaaaaaaaar

Kelly Clarkson - Since U Been Gone

Paris Hilton - Nothing in this World

S Club 7 - Don't Stop Moving

Gnarls Barkley - Crazy

Black Eyed Peas - I Gotta Feeling.

Umbrella - I can't think of a single song in the 00s that captivated people more

Bleeding Love- Leona
Poker Face/Bad Romance- GaGa

Can't Get You Out Of My Head or Toxic

Every time I try to think about this, and choose a song, another three pop up.

So I'm going to skip out on this!