Neltharion's Tear, from Vanilla to TBC, cause of the insane Hit Rating it gave (2% translated to 28 spellhit rating). Regarding weapons, Thunderfury could be used to tank up to Illidan in TBC. Insignia of the Alliance carried over from vanilla into TBC, until Medallion of the Alliance was released, which did the same thing but was a 2min CD instead of a 5min CD. That's...all I can think of atm.