I'm fairly new to freelancer but I'm a highly experienced designer with the one skill you probably need more than any other: a unique ability to listen and grasp complex scientific data including "computerese," and turn them into attractive, understandable visuals for any audience. I encourage you to contact me via pm so we can find out if we can a establish a 'meeting of the minds' that your project deserves, more so than a slick mass production.
My background includes, graphics, book, magazine, and newspaper design, plus I spent 10 years working for Oracle Corp., designing their user experience around server tools, installation, patching, and updating. I know a lot about the specific field of technical writing and how to present and package code snippets, tips and tricks, pedagogical material, self-quizzes, etc.
See more of my work at http://www.vanpeltart.com.