I was wondering if anyone knew of a site where I could see (current) samples of successful query letters, ideally that could be searched/sorted by genre? I say current because tastes/requrements change and while there are samples of QL's here and there, they are often 5-10+ years old.

There are 100's of sites with 'how-to' guides for writing a QL but I know (at least for me) reading a good QL in my genre is more helpful than having someone tell me 250-300 words, 2-3 paragraphs etc. I understand the formula but I think I and others would benefit from the examples.