I suppose I should first ask if you even know what the term "cloud computing" means. According to Wikipedia, cloud computing is Internet-based development and use of computer technology. Essentially, this means that rather than installing some type of hardware or software in your own business computers you just use the Internet to access the tools you need via the Internet.
In our case here at Scholl, Chyo & Company, CPAs we recently finished migrating our email, calendar, scheduling, tasks, etc. from our Microsoft Exchange Servers to Google's Apps Premier Edition. I can now say that we're thrilled with the results. We've been able to eliminate the cost of maintaining several expensive servers and saving David, our internal IT guru a ton of time and aggravation. At $50 per employee per year its cost is less than the annual Microsoft Exchange updates alone.