I'll list the TOP 10 for 3 charts (Overall [Note: JPOP only], Ringtones, Full Songs). The list was gathered between Jan 1st 2007 to June 10th 2007.
Overall TOP 10 (aka Sound TOP 10)
01 "Flavor of Life -Ballad Version-" - Utada Hikaru
02 "Tsubomi" - Kobukuro
03 "Lovin' Life" - FUNKY MONKEY BABYS
04 "WINDING ROAD" - ayaka X Kobukuro
05 "Lovers Again" - EXILE
06 "Baby Don't Cry" - Amuro Namie
07 "CHE.R.RY" - YUI
08 "Love so sweet" - Arashi
09 "Michi" - EXILE
10 "Flavor of Life" - Utada Hikaru
Ringtone TOP 10
01 "Flavor of Life -Ballad Version-" - Utada Hikaru
02 "Tsubomi" - Kobukuro
03 "WINDING ROAD" - ayaka X Kobukuro
04 "Lovin' Life" - FUNKY MONKEY BABYS
05 "Lovers Again" - EXILE
06 "Baby Don't Cry" - Amuro Namie
07 "Love so sweet" - Arashi
08 "CHE.R.RY" - YUI
09 "Girlfriend" - Avril Lavigne
10 "Michi" - EXILE
Full Songs TOP 10
01 "Flavor of Life" - Utada Hikaru
02 "Flavor of Life -Ballad Version-" - Utada Hikaru
03 "Lovin' Life" - FUNKY MONKEY BABYS
04 "CHE.R.RY" - YUI
05 "Tsubomi" - Kobukuro
06 "Lovers Again" - EXILE
07 "Mikazuki" - ayaka
08 "Eien ni to mo ni" - Kobukuro
09 "Sen no Yoru wo Koete" - Aqua Timez
10 "Rolling star" - YUI