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/Peo, FreeWebSpace.net
Wasn't MyInternet messing around with a service like this some time ago??? I just looked and their is nothing to be found on the current version of their site.
I think there are two problems with these services anyhow. One is that even if a domain expires, it doesn't mean it is available to register. Two is that whatever means you use to check whether a domain is available or not, is limited by how quickly the records are updated.
If you are searching for a specific name, then basically you'd want to set the script to check every x minutes, and then if no match is found, submit the domain for registration though your registrar.