just a little thought - how about some kind of messanger service for the site? i don't know a lot about this sort of thing, but a site i am a member of called madhive.com has this ‘bantu messanger’ which loads up when u log in and can be used in conjunction with msn, yahoo messengers and icq… it's really cool. other than that, what about a system by which users can leave private messages for one another, just something you can do on another site i know. just thought this might be a nice idea, as you can see who's online at the same time as you are, but there's no way to contact them.
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