PersonalVPN from Witopia has served me well for almost two years. I'd been meaning to get a VPN for a while for security reasons (I'd been using SSH port forwarding up to that point) but I really wanted to watch Moving Wallpaper on ITV and needed an IP address in the UK. Nowadays, I don't think I'll use any other VPN service unless I end up installing OpenVPN on one of my servers.
http://witopia.org/index.php/products/
When I originally chose Witopia, it cost about as much as the others I considered. The last I checked, though, Witopia had something like 60 endpoints in 20 countries and actually costs less than other VPN providers (StrongVPN, mentioned in another comment, offers 4 endpoints in 3 countries, and costs about $10 more).
They also started including Viscocity (a VPN client similar to Tunnelblick) as part of the package, and it comes preconfigured with all their VPN connections. I had actually purchased Viscocity separately and think it's a great VPN client for Mac OS X.
http://www.thesparklabs.com/viscosity/
I don't know if they bundle a VPN client for Windows or Linux.