If you want to play with it, send an email to firstname.lastname@example.org and you’ll be able to test it out with a bunch of other folks.
Over the next week I’ll be doing releases of librelist.com to match Lamson releases, so more features will show up. Top on the list are the archives and the list of lists as well as some tweaks to how mailing lists get created.
If you have suggestions, bring them up in test.list for now. There will be a new list shortly once librelist.com is out of beta.