could just as easily happen again if you don't take precautions.
I'ld like to see some measures made for those whose account value is too small to justify the cost of a Yubikey.
I'd like to see Mt Gox and other bitcoin exchanges offer the free two-factor authentication, Google Authenticator.
The following Bitcoin exchanges currently do offer optional two-factor authentication
BitFloor
Camp BX
Crypto X Change
Mercado Bitcoin
Mt Gox
I think this is a nice optional layer of security to offer for your clients. The 3 methods offered are:
Google Authenticator
SMS Text Message
Yubikey
Of the 3 methods listed above, personally, I prefer Google Authenticator
http://en.wikipedia.org/wiki/Google_AuthenticatorI don't like the yubikey because I don't want another piece of hardware.
SMS text message is OK, but I use a prepaid cellphone and have to pay for every text I receive. Being somewhat of a tightwad, I don't like that.
Google Authenticator works on my iPod touch and it's free.
If the cost is free even small accounts can afford to be secure. While it's probably best to just make this an optional level of security, Bitcoin exchanges could make it mandatory for accounts above a certain BTC or fiat currency balance.