Manaslinger is out of grantable levels, I'm afraid. However, Healslinger has 11 left to gift.
The triple XP, as mentioned already, will last up to 90 days from when the link was first created. It looks like the bonus XP has already expired on this link, on May 12th, 2010.
Unfortunately, as the link has expired, the levels won't be able to be gifted. =>.<=