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I like that filter. Duly noted.
When I did it (several times), I probably had a minimum of 100 failed or successes for each pinger, so I had really good data.
The google RPC's all great, but I wouldn't want to send the same results to multiple google pingers - that looks spammy. That's why it is best to only use a handful of very good ones - and all different ones.
@Ozz, so in other words the pings are only for the blog comments and not for the other links?
... in that case i would prolly prefer to skip the whole pings for better performance