Recently I found myself using tags links more often, e.g.
[tag:spring] rather than a normal link to library/product/framework home page like
[Spring](http://www.springsource.org/). This is much more convenient for me. However when the reader actually wants to browse to the home page, he must open tag info page and find the link somewhere. My suggestion is to add dedicated home page link field to tag info:
and expose that link on tag pop-up: