Picaso is ok but you have to teach them how to use it.. In my experience the best thing to do is to use php's gd library with a form and resize/upload the image on the fly so to speak..

While Picasa is great for those who are savvy, it is far from an ideal solution to present to a client. Afterall, we are trying to simplify things for them - aren't we?? So I agree with you, johned, add a resize-on-upload function to your cms.

Here's a simple php tutorial: PHP: Upload and Resize an Image - web.blazonry

~ OR ~

For an easy and cheaper solution try searching for online services that will do it for you: resize images online - Google Search

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... never used frontpage - hope it goes away soon.