The past week, I did some tweaking of my Keywording Tool Flemishtagger to get the work flow of keywording shots a bit faster: spell check is now in all windows so that's one click less to spell check the keywords.

Why FlemishTagger?

It's a script (program) to make the work flow of keywording images faster, especially as to sorting the keywords in order of relevance. Primarily done for Fotolia a year ago, CanStockPhoto now also introduced a 15-keyword limit.
In Fotolia you can sort on the site, but that's slow, very clumsy, and the result is not in your images' IPTC but on their site.

OK, since the keywords are in the script anyways, I added some more goodies like
- automatic removal of duplicates
- spell check
- 1-click delete of irrelevant keywords
- templates (you can add your own templates!)
- undo/redo
- output with all kind of separators (comma, semicolon, newline, space...)
- optional automatic sorting in function of the most popular keywords on SS and LO.

For the lazy  - Yes I know you can do the same in Word or any word processor, but then you need a lot of cut/paste, mouse/keyboard switching. Since I'm lazy by nature, I liked to have a script where all could be done with simple mouse-clicks. I'm using it for over a year now and all my latest shots are priority-keyworded in the IPTC.

If ever any other site comes up with keyword relevance in their search algorithm, my images are ready.

Is it safe? Yes, totally since javascript can't access files on your disk except cookies, and those aren't used. The only connection to my server is to increment a counter. The source code is open anyways.
Still paranoid? Download the script then on your PC (CTRL-S) and use it off-line. In fact, this will save you and me bandwidth when you use the script often.

What does it cost? The same price as the tutorials of RJMIZ: nada, rien, nichts, nothing, wala 

does it work with Raw files?

It doesn't work on the image files directly. It is just a glorified text editor for keywords. You will have to paste your keywords from/in whatever program you use to view/modify your images.
So if you have a raw image viewer/editor sure, you can paste keywords in there, like you would do it from Word.

I would never trust a program personally that accessed my images directly, unless it's PhotoShop or Irfanview. Even good old Exifer corrupted some images once.