The great thing about Go as a web language is that alot of the bones are already there - templates and HTTP handling are already waiting for you in the standard library.

The most popular web frameworks i've seen for Go so far are Web.go (a Web.py clone) and Revel (a Play clone). Frameworks will develop organically over time. The only reason they're not very strong at this stage is because as I said; most of the batteries you need for web development are already included in the standard library.