This very simple addon will allow you to use the "/ignore %t" command to ignore your current target without having to try to figure out how to type all those special characters that most players use in their name.
Updated: Version 1.1 fix a bug. Should work properly now.
Also, some people in raids/parties don't type anything at all via the in-game chat, yet give enough reasons to get ignored, so the only way to ignore them is by using the /ignore command (especially with such people who have left the raid/party already).