The tree menu has it's own mailing list: tree_menu@yahoogroups.com. I set up the mailing list so that those who wish can subscribe and get announcements when new versions are released, submit bugs, suggest features to be added, comment on the code, ask questions, etc.
There's three ways you can subscribe to the list. Number one is to drop by http://groups.yahoo.com and subscribe there. You'll have tons of options regarding your membership (how you wish to read the list, etc, etc). You can also send an e-mail to tree_menu-subscribe@yahoogroups.com and follow the instructions you then receive. Lastly you can enter your e-mail address in the form below and subscribe. There's also a link to the archive in case you'd like to read some old messages.