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Outdated, check out "Can I Mog It?" (WoWI/Curse)
I can't believe there is no addon for this yet (at least I can't find one, neither here nor on Curse)
Will It Mog? displays in the tooltip whether a weapon or armor piece of appropriate slot can be transmogrified, or be used as a source for transmogrification.
Only items that are uncommon (green) or better have the info always displayed, there are certain white items that can be used to transmogrify other items, but most are miscellaneous anyway (incompatible with Cloth/Leather/Mail/Plate)
By default, the addon will display short colored indicators, first value is whether you can transmogrify the item, second is whether you can use it to transmogrify another item.
Verbose mode, enabled with
/run WillItMog.verbose = true