I was looking on google for CCleaner and one of the first link I found (a commercial one) was : www.cleanersoft.net .
They propose to download an exe to instal CCleaner but, when you execute it, after a few "instal screen" they ask you for a code that you can get by sending 2 sms (GSM messages, I don't know the english word), and of course these sms cost money ; not much money so far (1 or 2 ?) but that's obviously a swindle and I don't think this is legal as long as you (Piriform) provide this wonderfull tool for free.
I don't know what you can do against these mother....ers but it's not the first time i see this kind of things with freeware ; and that makes me sick^^