The Georgics - In plain text, or as a zip file, from Project Gutenberg. - http://www.gutenberg.org/etext/232
The Bucolics and Eclogues - Plain text file at Project Gutenberg. - http://www.gutenberg.org/etext/230
About.com: Vergil and the Classical Tradition - Information on Vergil and his lasting influence on literature, with links to other Vergil essays and resources. - http://ancienthistory.about.com/library/weekly/aa021500a.htm
Bartleby.com: Vergil - Short biography of the Latin literary giant and text of the Aeneid from the 1909 Collier translation. - http://www.bartleby.com/people/Vergil.html
Vergil's Home Page - Links to Vergil sources of all sorts from the Classics Department of the University of Pennsylvania. - http://vergil.classics.upenn.edu/home/
Virgil.Org - Online search of Vergil's Latin works. Links to translations, bibliography, and books. - http://virgil.org/texts/
Virgil's Page - Includes an excerpt from the Georgics and from the Aeneid, the latter heavily annotated. - http://www.users.globalnet.co.uk/~loxias/latin.htm
Virgil Books Online - Includes "The Bucolics and Ecloges", "The Aeneid", and "The Georgics". - http://www.selfknowledge.com/447au.htm