Hi,
This new recruit a friend system is amazing. Triple xp when you party together, ability to summon eachother once an hour, free mount if your friend stays in the game for 2 months, and ability to give the lower level (veteran) player a free level for every 2 levels earned by the new player.
Only drawback is new accounts only.
Anyone interested? :P
http://us.blizzard.com/support/article.xml?articleId=20588
Yeah, seriously... I'm all up for inviting someone, =D.