I tried and I keep trying to contact Del.icio.us about their problematic web service but they took a page from the Google book and they don't respond to their customers.
Sampa integrated Del.icio.us in December of last year. It was a pretty easy integration, they have a fairly simple and documented API, so it wasn't a pain, and we added some very neat twist to the integration: Bookmark via Email.
Sampa customers did start using the integration after all, you just needed to provide your username and password to integrate with Sampa.
The problem is that on an ordinary day we have anywhere from 50 to 100 failures calling the Del.icio.us API, always with the error: 503 Server Unavailable. If you go to their site they tell you how to play nice with the Del.icio.us service. We do that. We do everything. We even implement a mechanism to prevent more than 1 request per second, but it doesn't matter. We continue to get hundreds of errors per week.
That is not a great experience for our customer and Del.icio.us is not being responsive (or responsible as a matter of fact).
Does anyone that reads this blog had a similar experience? Do you know somebody in Del.icio.us that can help us investigate this issue?
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in December of last year. It was a pretty easy integration, they have a fairly simple and documented API, so it wasn't a pain, and we added some very neat twist to the integration: 
October, 2007