Okay, I should mention that these are my top ten songs, and aren't necessarily songs that were heard on the radio (especially since I don't listen to the radio) so the likelihood of you finding something from the Top 40 on here is small. Also that doesn't exactly mean that you're going to find that all the songs on this list even came out in 2009.
10. "You Don't Know Me" Ben Folds and Regina Spektor
9. "Last of the American Girls" Green Day
8. "Running Up That Hill" Placebo
7. "Here's Lookin At You Kid" The Gaslight Anthem
6. "Lose You" Pete Yorn
5. "Fuck, Was I..." Jenny Owen Youngs
4. "Keepsake" State Radio
3. "Time Lapse Lifeline" Maria Taylor
2. "Kiss With A Fist" Florence + The Machine
1. "Any Other World" Mika
Honorary Mentions (Songs I still loved, but not as much...)
"Kristy, Are You Okay?" The Offspring
"You're Not Sorry" Taylor Swift
"You Wanted It" MoZella
"Under My Bed" meiko
"Amateur" Aimee Mann
"Goodnight, Travel Well" The Killers
"Fair" Remy Zero
2008's List