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I don't understand. Either this transaction has a valid signature or it doesn't. If it does, then AFACIT the only possible way that it could not be confirmed sooner or later is if it's a double-spend. What am I missing?

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Maybe blockchain.info generates its web pages from a database, and someone inserted a record into the database that doesn't correspond to a transaction with a valid signature? Although if that's the case you would maybe expect them to not mark it as "unconfirmed".

But surely someone would have just checked the signatures on these transactions by now? (I would do it myself but I'm not familiar enough with the bitcoin transaction format.)

They're definitely invalid transactions. The public keys and signatures do not match the address they're trying to spend from. Only blockchain.info failed to detect this minor detail.

"minor"

As in "this plane has no wings" - "that's minor"

The raw tx can be found at https://blockchain.info/rawtx/26d80a02ebdd9886b5a859c69c3470...

https://twitter.com/maraoz/status/628614596618813440 confirms it's a fake.

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