Mellowdrone - Limb To Limb (couldn't find a non-live version, sadly)
La Ritournelle - Sebastien Tellier
Build Me Up Buttercup - The Foundations
Right Here Waiting - Richard Marx
The Get Up Kids - Don't Hate Me
Polo Montanez covering Gilberto Santa Rose - Un Monton De Estrellas
Dashboard Confessional - Ender Will Save Us All
Sublime - Hope
Kathleen Hanna - I Wish I Was Him
Darwin's Waiting Room - Mario Andretti (Bus Driver Man)
One Line Drawing - Crush On Everyone (couldn't find a complete version unfortunately)
Piebald - American Hearts
GlassJaw - Pretty Lush
There's tons more I know and I'm sure i'll remember more as time goes by (god, what a high school flashback!)...
What songs remind you of the ghosts of your past?