I received a 44 net allocation and am successfully advertising it to the internet via my ISP.

I have been reading on the AMPRNet Wiki about IPIP tunnelling and Startampr. Are there best practices or anything else I need to be aware of before venturing into building the gateway?

It is advisable to make your system an IPIP tunnel gateway for the same subnet as you advertise via BGP. Make sure you use a non-44 public IP for the tunnel.

On a related note, I have been using OpenVPN to provide publicly routable /32 IP addresses to individual Windows PC. I don’t see support for IPIP on Windows, are there any other tunnelling methods worth looking at, for Windows7 specifically, or is OpenVPN my best bet?

We offer OpenVPN but beware: it allows an easy entry into the AMPRnet that has nothing to do with amateur radio anymore. You just become a VPN provider like there already are so many on internet.

To do something amateur-radio related with AMPRnet you really should offer radio access and encourage the users to use it, and OpenVPN works counter-productive in that regard.

Rob