Wisc-Online
Wisc Online: Identifying Eukaryotic Animal Cell Organelles
This is a tutorial slideshow showing the internal structure of an animal eukaryotic cell. Each slide has excellent labeled drawings accompanied by descriptive text explaining the function of each part.
Other
Midlands Technical College: The Eukaryotic Cell
The structure of a eukaryotic cell is explained using clear, detailed diagrams and accompanying text. A chart comparing the major differences between prokaryotic and eukaryotic cells is also presented.
University of California
Ucmp: Introduction to the Eukaryota
The huge diversity of the Eukaryota is described, including what has been preserved in fossils. The section, "More on Morphology", explains the biology of eukaryote cells in detail.
Other
Neil Patterson Publishers: Inside a Eukaryotic Cell
This watercolor picture shows a highly magnified sliver of a cross-section through a eukaryotic cell.