That should change now that Citrix has announced that Citrix Receiver supports the Biometric Associates baiMobile 3000MP Bluetooth Smart Card Reader and the baiMobile 301 USB Smart Card reader.
When GCN last year reviewed the Citrix Receiver software, we found it had good security for in-transit data, but did nothing for securing the endpoint - the mobile device being used by the mobile employee.
Many federal agencies have taken steps to begin implementing mobile work environments, though security remains a concern.