2.3 gingerbread - How do I set up a VPN from Android 2.3 to my home Ubuntu desktop?

I want to configure a VPN from my Nexus S (2.3.4) to my home Ubuntu desktop.

Has anyone tried this yet?

I would deeply appreciate tips on which VPN server to use (e.g., is openVPN support native on Android Gingerbread?) and pitfalls to avoid.