Digging a Memory Hole?

The lefty blogs are all atwitter over the observation that WhiteHouse.gov has recently begun preventing search engines from indexing and archiving pages in directories named "Iraq." There's speculation that this is a means of making it harder to spot retroactive changes to online documents (something that's apparently not uncommon). I'd thought there was a simpler way to do that if that's all they were after, but who knows. Either way, an interesting tidbit.