I've created a Photoshop script (for CS2+) that takes care of scaling down your images for the web. It's based on several techniques that I collected over the years and found best for the process of downscaling.
You can enter the final size of the image and adjust some settings. From there it's just ONE click to get to the result. Instructions in German, English and Norwegian are included. All my images are sharpened with that script of course and it saves me a lot of time.
You can download it here ... http://www.andreasresch.at/upload/WebSharpener.zip
Download it, spread the word and donate a little if you appreciate the results (the Paypal link is in the attached PDF).