Cisco Systems VPN Client 5 on x64

Hmm, nobody mentioned Shrew Soft VPN Client yet ? It's a free (as in beer) and cross platform VPN client that compatible with Windows 64 bit. Although free, but support from the author has been great. Currently it doesn't support hybrid xauth+certificate mode but the feature will come soon.

Lancom also provides a 64 bit VPN Client for Windows, but IMO they just resell/rebrand NCP's Client.

You can also try TheGreenBow VPN Client, which is a bit cheaper (56 EUR) than NCP/Lancom's client.

I have used this with Win7, Both 32 and 64-bit. I would imagine it is the same with Vista as they use the same PLAP component.

Start before login works, but is more annoying to use (IMO) than the implementation in the CVPN client. In essence, you need to download the PLAP component separately from cisco's website, and then in order to use it you must select 'Switch User' , then the unlabeled 'network connect' button every time you want to use it.