Dishes and laundry must be done, toilets cleaned, garbage taken out. It is what it takes to make a contribution in a household. Same thing in communities, somebody has to let their name stand for president of the committee, has to do the fund raising and the phone out.
The world of information is the same. There are mundane chores to do.
Web 2.0 is a two way deal. It is not enough for me to go to the web for info but I have to be willing to think, reflect and respond in kind so that the energy keeps moving.
Doesn't have to be much, a social bookmark in Delicious, a Tweet on Twitter, an email note to a friend who may be interested, or a blog entry. Make a contribution how ever small and pass it on.
I think it is also pretty important that this work not be left to the academics and public intellectuals although their contribution is valuable. Regular folks have a voice and ideally ideas will be judged on merit rather than an arbitrary authority or a credential. It is likely that academics will be skilled at critical thinking, analysis and reflective argument but this should not be a limitation for non-academics. We all need to pull our weight in the noosphere to the best of our ability.