I see you already got your answer, but I wanted to add how excellent of a program Gile[s] is. I use it not only as a lightmapper, but also as an editor to position items in levels and change/make new materials as well.
If you haven't already, download the demo from the site. I believe it's fully functional (except save) so you can really try it out before buying.
If you haven't already, download the demo from the site. I believe it's fully functional (except save) so you can really try it out before buying.