Welcome Barb - How exciting you joined. You definitely have a lot to offer. Check out all the great groups listed. There is so much involvement and information to be had on this website. Also be sure to check out Celt's blog on gardening - really good information.
I just got a 350.org update, in the past week alone, over 550 new events have been registered for 10/10/10. The current count is 2,500+ actions in over 150 countries, and growing every day. Watching so many new actions get signed up - it's tough not to feel a surging excitement for next month.