KoreanClick provides the following data for free.

Top Site by Domain (2009.06)

No	Domain	Unique Visitor (*1000)	Reach(%)	No	Domain	Unique Visitor (*1000)	Reach(%)
- 1		0		- 6		0
- 2		0		- 7		0
- 3		0		- 8		0
- 4		0		- 9		0
- 5		0		- 10		0

News/Media (2009.06)	Game (2009.06)
No Domain Unique Visitor (*1000) Reach(%)	No Application Unique User (*1000) 1 Starcraft 3,585 2 SuddenAttack 2,090 3 Maplestory 1,940 4 CrazyArcade 1,741 5 Pmang 뉴맞고 1,523