Int. Deployment of Security Tokens

In our company we are about to deploy 4000 Security Tokens (2-factor Authentication) to our staff worldwide (Asia, Australia, Africa, Europe, N-S America). This of course to bring our VPN into operation.
Any valuable feedback from whoever has had experience with such a task and who can provide information (Tip,Tricks and Traps) shall please provide their input here. We know to appreciate it.
Hans Loepfe