Songs that peaked at #2 on US HOT 100 from 2003-present
2003
Christina Aguilera - Beautiful
Ja Rule ft. Ashanti - Mesmerize
R.Kelly - Ignition (Remix)
Lil' Kim ft. 50 Cent - Magic Stick
Ashanti - Rock Wit U (Aww Baby)
Ruben Studdard - Flying Without Wings
Chingy - Right Thurr
Lil John & The Eastside Boys - Get Low
2004
Chingy ft. J-Weav - One Call Away
J-Kwon - Tipsy
Mario Winans ft. P. Diddy & Enya - I Don't Wanna Know
Hoobastank - The Reason
Lil' Flip ft. Lea - Sunshine
2005
Ciara ft. Missy Elliott - 1, 2 Step
Green Day - Boulevard Of Broken Dreams
Kelly Clarkson - Since U Been Gone
The Game ft. 50 Cent - Hate It Or Love It
Ciara ft. Ludacris - Oh
Bo Bice - Inside Your Heaven
Pussycat Dolls ft. Busta Rhymes - Don't Cha
Rihanna - Pon De Replay
Mariah Carey - Shake It Off
Nickleback - Photograph
2006
Gnarls Barkley - Crazy
Akon ft. Eminem - Smack That
2007
Fergie ft. will.i.am. - Fergalicious
Fall Out Boy - This Ain't A Scene, It's An Arms Race
Gwen Stefani ft. Akon - Sweet Escape
Ludacris ft. Mary J. Blige - Runaway Love
Ne-Yo - Because Of You
Shop Boyz - Party Like A Rockstar
Timbaland ft. OneRepublic - Apologize
2008
Chris Brown - With You
Chris Brown - Forever
David Archuleta - Crush
2009
Kanye West - Heartless
T.I. ft. Justin Timberlake - Dead And Gone
Jamie Fox ft. T-Pain - Blame It
Pitbull - I Know You Want Me
Drake - Best I Ever Had
Taylor Swift - You Belong With Me
Miley Cyrus - Part In The U.S.A.
Jay-Z ft. Rihanna & Kanye West - Run This Town
Lady Gaga - Bad Romance
2010
Iyaz - Replay
Lady Antebellum - Need You Now
Young Money ft. Llyod - Bedrock
Taylor Swift - Today Was A Fairytale
Artists For Haiti - We Are The World 25 For Haiti
B.o.B. ft. Hayley Williams - Airplanes
Taio Cruz - Dynamite
2011
P!nk - ****in' Perfect
Cee Lo Green - **** You
A real "blocked #1" is a song that peaked at #2 and was kept from #1 for several weeks. Songs like "Freak Like Me," "Since U Been Gone," "Bad Romance," and "Work It" fit the bill for me.
People are mentioning any song that peaked @ #2, which is too broad. Not every #2 song was "blocked" from #1.