Best (cheap) way to organize a group online?

[slackerinabox]

So I need to have a way for a group of like 40 people to organize online... I'd like to post announcements there (with them getting email reminders) and have a place for people to discuss things - any easy way to do this? Yahoo groups is cool but I don't want people to have to sign up for yahoo services/spam/etc.

 

[yllus]

Set up a copy of phpBB on a personal domain of yours and tell everyone to grab an account on it.

 

[RossMAN]

Yep that's possible with a CMS, you can have a mailing list setup, forums, and even make it private (password protected).

As sully recommended grab a domain and web hosting for under $20/yr.