As I understand it, you can't delete a profile comment but you can with guestbook. So until that is different, I am using guestbook rather than profile comments.
I think there was a mod for 6.0x to be able to delete profile comments I REALLY wish we had this for 6.1.1
I think there was a mod for 6.0x to be able to delete profile comments I REALLY wish we had this for 6.1.1