OpenLayers is an extremely popular framework for creating web-browser based mapping applications.
A developer in our Perth, Australia office, Chris Tapley, has created a "ECWP Layer Type" for OpenLayers. So, if you are using, or want to use, OpenLayers, you can now easily add an ECWP layer.
An example of this can be found at:
http://iws.erdas.com/OpenLayers_and_iws.htm
If you want to create your own OpenLayers / ECWP enabled maps you can download the code:
openlayers_and_iws.zip.
You can use any of the layers on iws.erdas.com for your web maps experiments.
Have fun, and let us know how you get on.