I recently received an email claiming to be from mtgox (It most certainly isn't)
From: MtGox <
noreply@mtgox.com>
Subject: Protect your Mt.Gox. account using Yubikey!
Protect your Mt.Gox. account using Yubikey!
We have attached your own personal Yubikey.
Download and install it.
Mt.Gox. Team
Content-Type: application/octet-stream; name="MtGoxYubikey.exe"
I've not been crazy enough to do anything with the exe file other than delete it.