Try Html2Wml
This page allows you to test Html2Wml. Type in a URL then click on the [Convert] button.
Please be patient. As SourceForge now forbids CGIs to access the outside world, this demonstration has been moved to a personal machine over a DSL link. It's usually available from 18:00 to 01:00 UTC. This machine is currently DOWN.
You can also try Html2Wml on Chris Flanigan's web site.
If you uncheck the "Debug" option, the result will be sent as a real WML deck, which you can browse only with a WAP emulator or with browsers that recognize WML. Take a look on the links page to know where to find apropriate software.