the new radiant 1.4 is out, if you didnt already know. you can get it from radiant's site, at:
http://qeradiant.com/)
unfortunately, there is a problem with installing it, and you will need to download two files and put them in your radiant folder yourself. here is a link to a map-center topic on how to fix it:
http://www.map-center.com/modules.php?name=Forums&file=viewtopic&t=2186#14579)
happy mapping!