Photography Rights

Recently I went hunting for information pertaining to photograph rights and I learnt some interesting stuff I thought I would share with you.
It is pretty much all about compensation (e.g. money). The photographer keeps all the rights to a photograph (or session of photographs) unless compensation is provided by the client. If you are hired to do portraits for someone, or to shoot their wedding, you keep the rights up until the point that compensation changes hands. If this never happens, then the rights never change hands either. In learning this, I have realized that I own all my photographs and their rights completely. It may not mean anything for me just yet, but it is handy information to know anyway. If someone ever wanted to use one of the photos I have taken of them for personal use, I know that they would have to get my permission to do so.
I have drafted up a model release form so that if compensation ever does come my way, I can continue using the photographs for personal advertising and other such things. I think I may draft one up stating the reverse, that the subject can use my photographs for their personal portfolios as well (also of course, stating any limitations I feel are necessary such as alterations of the original images by someone other than myself, etc).
I also read up about public photography but it is much more complicated and as it wasn’t the focus of my research, I don’t feel I could paraphrase it here just yet.