This MIGHT be a repost, I'm not sure, I did a quick search of the forums but didn't find anything immediately so I decided to throw this on here.
If you spec into ice floes(Ice Floes - Spell - World of Warcraft) and immediately after that shadowmeld (Shadowmeld - Spell - World of Warcraft)
You can move around for 15 seconds while shadowmelded. It doesn't consume the ice floes buff either. Could be usefull for some of you even though mage already has invis. c:
Don't think this is an intended side effect.