All installed on-line documentation will be served via a local HTTP server. When possible, dwww converts the documentation to HTML. You need to install both a CGI-capable HTTP server and a WWW browser to read the documentation.
k8to mentioned this package in a comment earlier on pinfo. I had forgotten all about this one. I use it frequently too. It makes reading (and sometimes finding) documents for your Debian packages much easier. Be sure to install info2www and dlocate.
More information on this package can be found on the Debian web site.
(If there is a package you would like to see featured here, go to the userinfo page and follow the directions there to submit your entry.)