What is the best shield in Wrath of the Lich King for protection paladins

There are two shields of note which drop in Icecrown Citadel. The Icecrown Glacial Wall, which drops from 25man Blood Queen; and Neverending Winter, which drops from the 10man Gunship event.

Both are also available in heroic versions. The Icecrown Glacial Wall has Block Value on it, which while useful, is still depreciated in ICC compared to Parry and Dodge. Its stats are much better than Neverending Winter, so that makes up for that itemization.