ToonDoo a cloud cartooning utility which I was singing the prasies of at Ulearn09 and have been using in classes here and in the UK for the last couple of years has just added a new service, specifically aimed at educational institutions who want to use the site but are concerned about privacy etc.  The new service is called ToonDooSpaces.  It is free to sign up and trial for 15 days, but after that and if you want to continue, there is a charge.  However as the books in and cartoon strips are embedable and always have been in ToonDoo then maybe your blog or Wiki will offer you the walled garden security that some are seeking.  For those of you that want ToonDoo and privacy, this new variant offers you a wider range of privacy but it will cost.