I have been a user of pingoat for a while now. It's reliable and easy to use
After adding a post to one of my blogs I went to pingoat to ... ping the post
Unfortunately the pinging service at pingoat is currently unavailable
Instead is one of those parked domain pages.
It's really sad to see pingoat go. I hope in the back of my mind that it is just temporary and they'll soon be back doing what they do best
It's interesting that the other service which I used from time to time kping also went down a while ago. But they have since come back but with a minor difference. There is now an opt in form to fill [name, email address and URL] before you can send your pings. Kping is still a free service, at least it was the last time I checked, but it is now a membership service
The problem with these services may be that they are so difficult to monetize. The Kping idea is an inspired one. The money is in the list after all
The good news is pingomatic seems to still be working...for now
Update of UPDATE!!
Not another pingoat update!!
It seems that Pingoat is still working but they are blocking the IPs of frequent users
Because I have so many blogs with reasonably frequent updates, it is understandable that I have intermittently had issues with accessing pingoat.
So to use Pingoat.com you will need a proxy. Unblocked.org is a reasonably user friendly proxy site
Also, there is another site called pingoat.net which looks identical to pingoat.com.