[Edu-sig] CS teaching approaches

hello, i will start introductory CS courses for middle school students (age 10 -13); i will mainly make use of logo-like languages and approaches, Turtle Art among a couple of others; i'd like to ask if you know which the most widespread approaches to CS teaching are today for young students, or if someone has collected on the web a simple classification among different approaches, showing similarities and differences; i'd like to let students taste something new and then report back to you the result of the courses thank you very much in advance -- roberto