Co-written by James:
Appreciate
Already Gone
Breathing Room
Girls Of Summer
Give In
Holly, I'm The One
Rise Again
Road Trip
Sanity
Smart Alecs (the theme tune for the ITV show)
Somebody Save Me
Unemotional
Window Seat
Yesterday Is Calling

Written by James and Tom Fletcher of McFly:
Back In Time
Babywatch Girl
Crying Awake

Written by Busted (or James, at least) and Owen Doyle, I believe:
Count To One

Written by James and Charlie:
Hands Tied

Written by Matt and Charlie, and probably James:
Just Couldnt Win
She Knows (featured on Busted's 1st demo tape)
Wannabe Celebrity

Written by the original Busted (James and Matt with Owen and Kiley {Ki} Fitzgerald:
Spacewalker.