I am pleased to announce our new RCM tools website which allows one to interactively apply recursive conditional means (RCM) methods to images:
http://rcm.cps.utexas.edu/
Current applications include denoising and enlargement.
The site's primary intention is to provide a way for developers to compare algorithms, but you may also find it useful simply as an image processing tool.
Of course, the server side makes much use of ImageMagick for resizing and format conversion.
Technical information and application examples, including both qualitative and quantitative algorithm comparisons may be found at:
http://www.cps.utexas.edu/natural_scenes/
Jeff