Single Sign On with USB Tokens

["Carlos Andres Rodriguez C." <carlosarodriguezc () gmail com>]

Hi,

I'm looking for a Single Sign On (SSO) solution based on USB tokens that 
works with multiplatform environments.... Does anyone here in the list 
know about any vendors who offers these kind of products?

Thanks

Carlos Andrés Rodríguez C.
CISSP, BS7799-2 Lead Auditor