In the spirit of the open source movement, new copyright-friendly (and some copyleft) archives are emerging, removing many of the legal and ethical thorns relating to image use in student production. In addition, a number of government image archives provide their archives with limited restrictions.
IF we can work together, restrictions placed on all the students can be lightened. The crass actions of the few should not (but sadly do) hinder those of us who know how to behave. By this age, we should all know right from wrong. Myspace shouldn't have to be blocked; it should just be common knowledge that visiting your personal blog during your educational time period is not right.
IF you have to wonder if the site you want to use it appropriate, it probably isn't. But you do have teachers and administrators to view and help you make that judgement.
DON'T copyright infringe or plagarize or download anything illegally