The use of Pedalopolis' Message Forums will probably be familiar to you.  They are similar to many other message forums found on the 'Net, including Yahoo's Groups and BikeForums .

Spend a little time looking over the categories and forum topics to find the areas you are interested in.  Then, browse the existing messages and start particiapting in the discussion!

For complete details on how to use the Message Forums, see the Help pages.