It would seem that this SBL listing means that if you have a blog at http://(something).blogspot.com, your mail is going to be blocked by any site that checks the IP addresses of URLs found in messages, to see if those IP addresses are blacklisted.
Read more about it here.
I don't necessarily have an opinion on this at the moment. The devil's in the details, and I'm short on details. Generally speaking, I do want Spamhaus (and other blacklists) to bring the smack down on the bad guys. And if Google is (even unintentionally) being one of the bad guys by not doing enough to prevent spammers from using Blogger blogs as landing pages for spam, then that's a bad thing.
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