There was a thread on here with links to free presets, although they were all probably LR3 it was so long ago! I've picked up some free ones from OnOne when they release them, I did recently grab a load of free ones that a chap released through his blog but they're not titled so a pain to use (they are 365 of them). I did buy some a while back (Gavin Seim). I'm all for paying for them if it saves me spending my limited free time trying to work out my own, if I did have free time though...