Hi Violet & Chuck,
Many apologies for the delay in responding. It's been a whirlwind over here at Top Quark.
Violet, to answer your questions:
1) It does not currently handle automatically mailing new posts to subscribers
2) There are notifications built into poMMo. You access them by going to poMMo > Setup > Configure > Messages (near the bottom). You can put the information from their form into the “Notify New Registration” message (the last one) by including [[info]] anywhere within the message. If you put a Big Text field on your form, then you'll be able to have them ask questions. The one drawback to this is that it doesn't allow them to ask multiple questions. Questions would only be asked when they signup for the list the first time. I'm not sure if this is an ideal solution. You might just be looking for a contact form – Formidable is a great plugin for building forms for WordPress
3) poMMo does not handle the email the page to a friend. I think there are other plugins out there that do that.
There is not, as far as I know, any active development of poMMo on the pommo.org page. The project is dormant. My integration into WordPress is from a fork of the project that I used to implement a newsletter for some of my clients. I've enjoyed using it and wanted to give back to the community, thus the reason I released it. You can come to me with questions, but to be honest, it isn't on the top of my development priority list, so I can't say how much active development there'll be over the foreseeable future.
Chuck, on to you. Formidable Pro integration sounds awesome, but see the previous paragraph. As for multiple lists, it is actually able to do this with the addition of an add-on plugin I'm selling here called poMMo Plus (http://topquark.com/extend/plu…..ommo-plus/). Using the features it adds, you can have a single large email list segmented into “contexts” giving finer control over who appears in each. This may be overkill for your purposes (which may be able to be solved using a “Choose Many” field of lists and then setting up the groups properly, but it's worthwhile to know. Take a read through the real-world example on the above link. If you decide to go this route, I'll be happy to help you get it setup.
As for integration with the WordPress users and roles, I agree that would be great. In general, I'd like to see it such that when someone signs up for the poMMo list, they can automatically be added as a WordPress user. But, that's not in there now.
As for playing nicely with Child Themes, it should do okay on that one. Each child theme's stylesheet would style the pommo form specific to its theme.
I wish I had more gung ho answers for you and I wish I could say that this was my only development project, but that's simply not the case. If you decide to use poMMo, I'll be happy to help as I can to help you get it set up.
Cheers
Trevor