Hosted by the Virual Hospital, it was created by Ronald A. Bergman a professor of Anatomy at the University of Iowa. NOt only does this atlas contain hundreds of labeled slides of the various tissue types, but it links to discussions of health related content for each targeted to health care providers and consumers.
This site from Southern Illinois University features a detailed outline
characterizing each of the four major tissue types along with a good number of
slides showing typical specimens of each tissue subcategory. This is a must
see site.
This site holds an extensive collection of slides showing tissue sections at
various magnifications of the major tissue types taken from a variety of
locations in the body. It is set up as a typical medical school histology lab
in which you can view the images with and without labels.
This link from the Animal Sciences at Southern Illinois University offers a concise outline about tissues and their characteristics. It also links to some descriptive sites at the National University of Singapore, but when I tried these, they didn't work.
These are the University of Delaware Histology Pages created by Professor of Biological Sciences, Roger Wagner, for a course in Mammalian Histology. Links from this page connect to a rich set of photomicrographs of tissues and cells.
Here are additional useful histology (the study of tissues) links from the Jaydoc Histoweb: