341 has a whole sub-team devoted to media so we do allot. Every year we create vlogs during and after build season. Normally we have a few students talk about the prototype or project they are currently working on. Lately we have been a little more cautious with what we post in our vlogs and what the team puts out but we still try to show basic concepts without showing every detail. We normally cover whats going on with the team in, whose working on what, what changes have been made, etc. During and after competition season we also do recaps. They are just videos often the same length as our vlogs that talk about what happened while we were there and how we did. We also have a Flickr page where we upload all of our photos. My favorite part of robotic teams' YouTube accounts are reveal videos. Unfortunately we weren't able to put one out last year but I highly suggest making one. People love seeing robots before competition and what everyone has been working on. Its also an opportunity to make your team look really good. My best advice is to think about your team's alumni that want to keep up with the team and want to know whats happening. If you think they would be interested in seeing it I would suggest making a video about it.
Check out our YouTube page if you want to get a more specific idea of what my team dose.
http://www.youtube.com/user/daisy341