Depending on what exactly you are looking for, our team uses a cross between mailman (a linux group e-mail program) which is similar to yahoo groups but no ads and we have more control. Our web presence is two-fold. We have our general
www.bprobotics.com which is for the community, sponsors, media, etc. and then we have our team portal. This is based off of phpnuke. PM and I will send you the link to that private site so you can see what we have done if you are interested.
OK... so I just re-read your question. A bunch of my friends use an IRC server that one of us hosts. If you have a good linux person on your team, they can get an irc server running (however this requires typing to communicate). You could also record audio files and stream them out.
However, it seems like you guys are just too lazy to meet! So, have a meeting every other week and make it quick and use a web site to aid your information disemination!