[jj00]

I use it, but I have to admit I'm not much of a fan. All it has done is annoy me by forcing me to stop my flow and look-up a secondary field.

I think there should be a 3rd option of just having a second password. Better yet, add a few other options as well.

[0xffff2]

What additional security would be derived from a second password?

[jj00]

A second password is just another form of a second factor (in 2-factor authorization)

[stephenr]

2 factor auth is "something I know" (password) and "something I have" (token/device to provide a one time password)

Two passwords you know is not 2 factor auth

[EpicEng]

No, it's one factor, twice.

[mobiplayer]

Not even twice, just split in two fields :)