Twemes.com follows public Twitter.com tweets (messages) that have embedded tags that start with a # character. These are sometimes called hashtags but we like to use the term twemes.
Through the use of twemes, we can all view what people are talking about across the whole Twitter universe. In some sense, this can be thought of as an adhoc chatroom. We also pull in recent public photos from Flickr and public bookmarks from Del.icio.us.
Twemes.com is particularly useful for keeping up on the real-time activities associated with a live event such as a conference. People who attend an event can choose an obvious tag (i.e., sxsw for South by Southwest) and use this tag as #sxsw in tweets, sxsw in uploaded Flickr photos and Del.icio.us links.
Twemes.com also allows for adhoc polls to be created associated to a tweme.
See the help page for more detailed usage instruction for including twemes in your tweets!