Many agencies and job sites require the CV to be in MS word format, often due to maintaining the CVs in legacy MS Access databases or applications that only supported that format. Typically they also re-format CVs into a house style and omit your contact details when the present it to the client so the client doesn't work around them by contacting you directly. Again, they will want to get the CV in MS Word format to do this.
I've had problems in the past with CVs in PDF, and agencies have always asked for MS word. Whatever choice you make, you're probably stuck with having to produce the CV in .doc format at some point. Practically, this limits your choice to tools that will play nicely with .doc, .docx or possibly .rtf.
Options are: OpenOffice, ABIWord, KOffice, Wordperfect and possibly Framemaker. LaTeX to RTF converters do exist, although I've never used them and I don't really know whether the output is any good. I don't see anything obvious about docbook to RTF converters, but print formatters for docbook often go through TeX anyway.
If you still need to get PDF from these tools PDFCreator is based on Ghostscript and does a reasonably good job of producing PDF output from a word processor.