It's probably to do with the "Friends with blogs" and similar sections in your sidebar. These automatically generate lots of links to other blogs, which are then picked up by search engines etc. Google Blog Search sometimes seems to filter out blogroll and sidebar links, but at other times fails to do so. I wouldn't worry about it too much, but if others object you can offer to take them out of your sidebar.
thank you for your time, Peter- that helps me understand what's going on.
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