many of the past issues were on thematic concerns; ever of greater importance in academic and knowledge communities is the how-to of electronic publishing
a visual map, with links, of how to use metasites for knowledge acquisition, research, and reading online; author has other such maps on his site; useful for students as mode of presenting info and for info itself.
You sign up, enter the name of a book, then find out what other folks who liked that book also liked; a tag cloud for the book leads to other books on this topic. Quite addictive, and I just used it to look at the info. around one book.