Recently I started a new side-project, using some full-text search done with Solr, intending to put it on Heroku. However, I had forgotten that Heroku doesn't allow any Solr for free! So I ripped it out and looked for alternatives, winding up with pg_search. I ran up against some problems, but figured out some workarounds, and wrote them up in a two-part blog post:
http://www.codosaur.us/2012/09/free-full-text-search-with-heroku-part-1.html
and
http://www.codosaur.us/2012/09/free-full-text-search-with-heroku-part-2.html
Share And Enjoy! Dave