business online communities

What are good ways to promote its line of health and online .. nutrition activities?
How do I let people my business word of mouth is that I know with PPL and colleagues. And go to the gym for yoga studios etc. I just want to know what you might be able to make line. I was thinking about how to make a yahoo group or something like that, but I would like to know maybe some of you have started marketing your online business or if you know something about creating online communities to talk about what we can offer .. Maybe a few websites that are available to start or simply for more information? Any advice would be greatly appreciated
Enginger there are many free search and exchange Banner programs http://www.google.com/search?hl=en&rlz=1T4HPIB_en___US258&q=banner+exchange post your link and a bad image on him and see if it corresponds with the content on my site if you do ill add your link to my site is free http://99half.org
Future Consumers, Lifestyles and Online Communities – impact of new technology, communications, wireless networking on business and personal life. Patrick Dixon – Futurist / Futurologist conference keynote speaker