online Japanese practice - produced by Duke, "renshuu.org"

http://www.renshuu.org is a free Japanese study site that was originally made for Duke University and has been running for several years. It offers personalized and dynamic quizzing for several widely used textbooks.

There are quiz methods for both kanji characters and vocabulary. The personal schedule tool helps students to study their weakest areas.

The grammar library has about 350 grammar expressions, hundreds of model sentences, and areas for students to practice using the grammar and give/receive feedback from others.

guided, stepped reading Japanese texts

From senseionline@yahoogroups today [digest 3129]

The "Read Real Japanese" books are nice, too--but they provide English translations where the "Readers" do not.

One of the Graded Readers at Whiterabbitpress.com:

http://www.whiterabbitpress.com/product.php?productid=16723&cat=266&page=1

Read Real Japanese:
http://www.whiterabbitpress.com/product.php?productid=16591&cat=0&page=2

and:
http://www.whiterabbitpress.com/product.php?productid=16590&cat=0&page=2

Exploring Japanese Literature:
http://www.whiterabbitpress.com/product.php?productid=16513&cat=0&page=1

--ALSO--
Breaking into Japanese Literature (at amazon.com):
http://www.amazon.com/Breaking-into-Japanese-Literature-Classics/dp/4770028997/ref=sr_1_1?ie=UTF8&s=books&qid=1264428931&sr=8-1