Techlore’s VPN Toolkit is an excellent, crowd-sourced guide to VPN services.
The site rates VPNs across dozens of criteria and lets users quickly filter down to the VPN that would best meet their needs.
The site even features a “DIY Review Tool” that lets you create your own personal ranking chart if you happen to be knowledgeable about VPNs.
Just an all-around excellent site and a good example of how to really do a thorough website for a niche topic.