University of California
Ucmp: Introduction to the Rotifera
Very good introduction to the biology of these little creatures. Includes good pictures and nice background information.
Other
Micrographia: Bdelloid Rotifers
Information on Bdelloid rotifers, the most commonly found variety of rotifer found in fresh water. Includes pictures and example of rotifers.
Microscopy UK
Microscopy Uk: Rotifers
Good simple coverage of rotifers. Good images and explanations of the phyla's general characteristics.
Florida State University
Florida State University: Collotheca (Rotifera) Movies
Select from one of two movies which depict a rotifer feeding while traveling slowly in pond environment. Background information is provided on rotifers in this interesting site.