Cisco released new firmware for ASA - 8.0(2).
WebVPN significantly improved: provides RDP, Citrix, VNC access, AnyConnect - SSL VPN client, better Cisco Security Desktop. If you use WebVPN I suggest you to update ASAP. The admin interface is somewhat different, sometimes confusing. But it gives all you need to get stable WebVPN.
Unfortunately there are some known bugs in this version, as example:
CSCsj00288 CSD - Keystroke Logger check fails when HP Quick Launch app is running
I just discovered new release of CSD - 18.104.22.168, let's try...