Did you look at First Aid for the Match. I believe there is a section in there with good strategies for specialty specific PSs. If not, there is a reference section. I also believe that Iserson's Guide to Residency has some good strategies too. There's a new edition on the way out too.
I have just googled for some and found some random ones... can't tell you if they're good or bad, but I'm in the same boat you are... I'm applying for peds, but lately trying to write my personal statement has felt like bashing my head against a brick wall!!! Can't wait till it's done!