While we're at it .. are there any other tokens/smartcards that could be used for signing messages (ECC preferable, RSA acceptable)? I only know of YubiKey and the KernelConcepts PGPcard.
But now PlugUp web site, http://pu1.fr, redirects to a trendy, rebranded site that I can't get to work. So I don't know if that vendor exists anymore.
I am excited about YubiCo products. The key I have Just Works, looks and feels very well-made.