Spelling & Grammar checkers when working with DocBook

Hello all!

I'm setting up a DocBook environment for producing user documentation of a 
software product. The authors will be the developers, which have varied 
talent for writing end-user documentation.

I would like to hear what approaces others have with regard to spelling 
check (fairly easy) and grammar checking when working with DocBook? The 
XMLMind has a spelling checker, but I have not yet tested how useful it is.

What is the general opinion on this? Are there any products - free or 
commercial - to do grammar checking? One suggested approach is to produce 
.rtf format only to import to MS Word once in a while to get a check, but 
there might be something better?

G

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