Subdomains allows users to setup there main categories as subdomains. It's a lite and fast code.
html in autor bios
Add or Remove Www lets you easily configure your WordPress site to always (or never) use the www. subdomain in all links of the posts and pages.
Use this plugin to autofill the Site ID field by searching for a site domain on your network.
Automatically maps subdomains to page and post permalinks based on post slug.
Setup your main categories, pages, and authors as subdomains with custom themes. Surely will come for more options...
Changes the cookie default path to / (i.e. the whole domain.com not just domain.com/blog) with an option to go across subdomains
WP Subdomains is a plugin for WordPress that allows you to setup your main categories, pages and authors as subdomains.