A corporate blogging community provides many more benefits for businesses than a collection of individual blogs:
1. They are easily aggregated into a single point of entry (see blogs.borland.com and blogs.msdn.com), quickly demonstrating the breadth of depth of collective knowledge within an organisation
2. They can be "controlled" by an organisation - you can ensure your community reflects your 3. own policies, not those of an independent blog provider
3. The software is cheap and simple to implement, whatever flavour of technology you prefer
4. Readers can subscribe to your aggregated RSS feed, as well as individuals'
5. The success of individual blogs will reflect well on the wider community - and your brand
6. By consolidating category taxonomy, you can create sub-communities of interest
7. All blogs within your community can be branded to reflect your organisation