Hello there!
I have spoken to Andrew Maltsev from ISBNdb.com Support. Lately Toolserver's IP was blocked for our API, because we were using different accounts, which is against their policy. I explained that to him, that we are different users, that is why all the requests come from the one and only IP. He is very polite and understanding, already re-enabled my ISBNdb key. And here goes my announcement:
If you do have a tool that uses ISBNdb API, contact Andrew Maltsev at support@isbndb.com and tell him about you being the Toolserver user, about your tool and ask him to re-enable your key.
So far I have seen that Magnus Manke and User:° (gradzeichen) are using ISBNdb API. Anyone else, who is using the API, pwetty pwetty pwease, contact their support. I think, we prolly can make some bigger collaboration with their project for the good of all of us. I don't have any ideas so far, so brainstorm could be useful. :)
Thanks in advance!