Traffic Sources:
USFreeads
affiliates
Slide sharing (Slideshare.com)
Link Directories
traffic exchanges
List Brokers
Popups/Unders/Overs etc..
Software apps (facebook, toolbars, etc.)
Software/scripts included in CPanel/Fantastico
Pinging your pages and the pages on other sites which link to yours.
Blogs
XML sharing (PADs, Feeds, Sitemaps, RSS etc.)
Wikis
Article directories, and reprinted articles
CPA...