uitags works with IE 6 and Firefox 1.5 (and likely with older versions of Firefox as well).
uitags has been tested and works on the following containers:
Unfortunately no. There are huge fundamental differences between v1 and v0 which break compatibility between the two.
This benefit does come at a price though. Your code tends to become more verbose since you have to write two pieces of code: code for generating widgets, and code for injecting behavior to them. Those who like custom tags to encapsulate both may be disappointed. There are a several solutions to this. Our favorite is to create a JSP 2.0 tag file which wraps both pieces of code.
The demo sampleapp contains a number of convenience tag files which you can adapt for your own application. It is important to note that these tag files are not part of uitags official package hence they are not supported. Between releases, we may make dramatic changes to them without providing any upgrade guide.