I guess you'll laugh at me now, <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> but there is a version of MS Word, where you can make pretty good arrows in it. I've used it.
And for small arrows go to Insert/Symbol et voila, some small cute arrows <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
Word isn't really a drawing program, but you can indeed adapt images with it.
