I don't have any of my site except blog but yes I failed many of my clients sites doing all kind of seo experiments. Still success ratio is 90 % . so won't hurt.
I had one site that was almost 1 year not indexed at google ...now it is very well indexed and PR went up.
My first site was a huge success, made $1000ish in it's first month. I was pretty shocked since it was basically a free website provided by an affiliate program that I threw up on a domain and did some link building to it. I grew it to about $2500/month before selling it. My second website was a complete failure because I couldn't find the right way to monetize it. The site was focused around strange and unusual news/events and it did actually get a fair bit of traffic (500+ uniques/daily after about 2 months of SEO work). But it was hard to find products/ads that worked with it (though I did sell 2 rubber chickens on it somehow lol).
this is one of my more recent failures...Film Fights Cool idea, but just couldn't get enough traffic to it...or find a way to monetize it.
My very initial site was big failure when i thought to skip web stuff but my friend realized that big failures are identification of good future afterward s i never looked back again however it was a news portal custom designed
I don't really believe in failed websites. When I thing a website fails I often come back to it a few months later and I can figure out what's wrong with it. So, it was me, not the website. But in general, not just for websites, I have about 2 failures for every success, maybe 3. The big idea in this? Fail faster!
My first site was my biggest success! But then I sold it and couldn't get one as big as it was. Then after that, I had about 5 failures. Then I had a success again, sold it. Now I'm working on a site that really is becoming a success fast.