Radiant recently stopped working for me, so I went for a hunt for a fix...
For those that are familiar to radiant 1.5.0 and would like to upgrade to a better version of it, that is being actively developed, check out NetRadiant.

http://dev.alientrap.org/wiki/netradiant/NetRadiant

I just copied the wop.game file from radiant-1.5.0 installation over to the games folder in netradiant, and copied the wop folders over as well. Worked instantly.

Clipper tool is much easier to use! No more deleting the wrong half of the brush.. Woopee!

I think most linux users in this forum already know this.
By the way, take a look at this

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Ahh, someone beat me to NetRadiant in the german forum, eh? :p

Meh, it's not just for linux users - anyone who wants something similar to 1.5.0 but that isn't old and is being actively developed should get it.

EDIT:
We could try get a GPL version of the WoP mapping pack together? Uh.. I guess that means no wop textures, skyboxes, shadars etc? Guess not then... :p