Once I found out about customized install.php for WP, I actually had this in mind -- creating sets of WP installs for certain types of blog installs. I'm currently doing an Internet marketing installation profile (still on the fence on making it commercial or GPL, but I'm leaning towards the latter), and plan on developing an installation profile for either e-learning or e-shop. Finding out about the Drupal installation profile got me excited even more.

Someone should initiate building a page in WP.org listing all these installation profiles and create some sort of repository for people to check them out.