Each of these examples is meant to show the Honeycomb Beeline for Go in action in that particular framework's vocabulary. The examples show simple example use of the Beeline to set up the outermost HTTP wrapper and capture some useful per-request context.
Two of these examples go a little bit further and are intended to show off more full-fledged use of the Beeline:
nethttp contains an example of "everything you can do with the Beeline," including:
beginning a trace
creating extra spans within a trace
hooking into the Beeline's sampler function (in order to intelligently sample the events emitted)
using scrubber functions as callbacks to obscure sensitive metadata
instrumenting outbound requests (aka, what you want to use when sending things to other instrumented apps)
http_and_sql contains an example of using both nethttp and sql wrappers together in a single application.