Well I really like this idea, because I'm a post-it addict. Actually, I use post-it for everything, I even use virtual post it on my mobile phone ! That will be really funny to do this at school, and the concept of writing the words with their prononciation is very interesting, it will be a good way to learn phonetic alphabet :-p Moreover, I find it quite beautiful, all this colorful little papers =)

I use sticky notes for everything and everywhere... in different sizes and colours, to remember things, to get organized, to learn new expressions... Used them to get my pupils to get around the syntax of the question and to write questions on the white board when I worked in college.

I'm such a sticky note addict that a friend of mine who had stayed in my house for the holidays planted  dozens of them everywhere in the house. It took me months to discover them all.