If you want to insert a value into an identity column you can use the SET IDENTITY_INSERT statement.
SET IDENTITY_INSERT Yaks ON
Insert Yaks (YakID, YakName) Values(1, 'Mac the Yak')
SET IDENTITY_INSERT Yaks OFF
select * from yaks
Read more about IDENTITY here - http://www.sqlteam.com/item.asp?ItemID=8003