According to stackexchange.com, the network has 94 Q&A sites:
But the new about page disagrees:
My first guess was that the about page count included private betas, but according to Area 51 there are only two of them currently (ELL and Magento). Tim Stone has a better explanation for the inconsistency:
There are 98 sites, two of which are private betas, and two of which are Meta Stack Overflow and StackApps, which are only
main_siteQ&A sites in the technical sense. The about page should show 94 sites.
Whatever the reason, the counts shouldn't really be different, let's pick one and stick with it.