VPN:
IPSec Remote VPN Clients
sh vpn-sessiondb remote
L2L Tunnels
sh vpn-sessiondb l2l
SSL VPN / Anyconnect Clients
sh vpn-sessiondb svc
SSH:
show users connected to ASA via SSH
sh ssh sessions
(http://www.dslreports.com/forum/r22984757-Cisco-ASA-show-VPN-and-SSH-users)