How to get Cisco VPN Client to work with Windows 8
Internet access across a VPN to the hub site requires a hairpin to egress the ingress interface.
Okay, if you read this http://www.cisco.com/web/software/282364316/31835/5.0.07.0240-beta-rel-notes.txt it says that x64 support for Windows 7 and Vista is finally here. It's just that it also says that 64 bit isn't supported.
You may or may not have problems doing Windows style authentication to your Server 2008 for your AAA access on your ASA firewall. LDAP allows "stacking" of membership attributes allowing fine-grained inheritance of group policies on Cisco VPNs to ASA.