Grove Art Online - This is a reliable place to begin your research. In the upper right, type "baroque" and you will be led to several sites.
Baroque - This site is a lengthy essay on the Baroque in different countries.
Baroque Art - This site will get you to a large collection of paintings and artists.
Artists by Movement: The Baroque Era - Good for painters and their work.
Itineraries of Baroque's Art - Baroque art in several Italian cities.
Baroque Art, Baroque Artists: A Web Directory - Good for artists and images.
Guided Tours - Contains 14 guided tours on Renaissance and Baroque art.
Baroque Art Prints - Arranged by either author or title.
Italian Sculpture 1200-
Art History: Baroque - Good for artists and biography.
ArtLex Definition and pictures'