Dynamically Resizing Image Service
There’s an interesting free service at http://tinysrc.mobi/. It takes an image you specify and, depending on the URL you specify, resizes it to a specific size. It can be used in your mobile web pages or might even be used stand-alone to resize images for including in applications.
Tinysrc also caches images it is asked to fetch so that the original image source doesn’t get over-used. The only downside is that, being free, there’s no SLA so it’s less suitable for commercial use and more suitable for personal or experimental mashups.