This poller *should* display the number of Active SSL VPN (Anyconnect) Tunnels currently connected to your box. However, I tried it with my 5520 running 8.0.4 and for some reason I get a OID Not Supported.
Here's my post in the forum:
*EDIT*
This is confirmed working with at least Interm release 8.0.4(3) and above
-SK