SchoolRack looks like a really nice way for teachers to create on-line space where they can share course or lesson materials and set up access for students or parents. While some of us struggle with complex VLEs and various other expensive or clunky selections of letters I have a feeling that colleagues could just set up something like this and go. Free and ad-free in its basic, but from what I can see from a brief look, perfectly adequate form for many, this is worth a look. This link takes you their nice demo, not obviously accessible from their home page!

Incidentally, this is another example of Twitter working well as it was someone's post about this that brought it to my attention.