We've all read about Web 2.0 and the impact it will have on 21st-century businesses. Some find the principles life altering, others say it's pure hype. Whichever camp you are in, you can't ignore the fact that business is changing—especially online.

As the owner of an online marketing and design company and a former marketing director at AOL, I've watched the Web grow and change since 1994. I've had to figure out how Web 2.0 principles actually impact online businesses right now so that my customers are prepared.

For this reason, I've targeted five categories that managers need to consider now to keep in step with Web 2.0 changes.

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