Is there currently a good web framework for Go? Edit: web.go looks pretty sweet: http://www.getwebgo.com/ Edit2: As does app.go: https://github.com/georgenava/appgo ...There's a large list of Go projects here: http://godashboard.appspot.com/project
The standard library gives you almost everything you need.
The http package provides a web server and client: http://weekly.golang.org/net/http/
The template package provides text templates: http://weekly.golang.org/text/template/ and automatically-escaped HTML templates: http://weekly.golang.org/html/template/
For other bits and pieces, see the rest of the standard library: http://weekly.golang.org/
I also recommend the Gorilla Web Toolkit for some other useful web-app functionality: http://gorilla-web.appspot.com/