There are currently 3 mailing lists / Yahoo groups devoted to the activeRenderer Radio tool, quite a lot really :-)

• ar-announce is a slow traffic, read only list where I announce all updates to activeRenderer. All release messages include a description of new features, enumeration of fixed bugs, and a list of updated parts. Click here to subscribe or unsubscribe.
• ar-support is a moderately active discussion forum to discuss all installation issues, report potential bugs, request new features and so on. Scan its archive when trying to solve a problem, there's a good chance it was already reported, and maybe even solved :-). Click here to subscribe or unsubscribe.
• ar-devel is a moderated list for developers interested in contributing code to the tool, or porting its features to other environments via the activeRenderer API.. Click here to subscribe or unsubscribe.

I check all mailing lists on a daily basis, even when not working on the activeRenderer project: they are my main channel of feedback information, together with the feedback link in included in all pages of the activeRenderer site.