I looked into wordpress, and while it's a good option, I didn't like it's templating system. I found it was too hard to implement into an existing layout.
I use
pmachine, a similar script that allows for much more customization and easy HTML templating. (Assuming you already have a solid grasp on HTML and at least some knowledge of PHP)
My site is
http://www.twoplustwoequalsfive.com, which hosts both my and my brother's blog. Both are run using pmachine, vouching for the versatility of it's templating. They're on separate installs too, making maintaining different blogs easier. Pmachine also has a nice category system that would allow you to easily call up all entries, or just entries based on category (which could be your different sub-teams).
Give pmachine a look.