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Wizard - 10:56 am on Jun 30, 2005 (gmt 0)
You'd agree, that imagemaps can be used to put hidden links, wouldn't you? That'd be possible reason. MSN and Yahoo don't worry for being manipulated as much as Google does. That's why Google results are less spammed, at least in some subject categories.
Google is very reluctant to index anything but regular A HREF links placed in document BODY. Recently, I noticed that Google does not follow links inside NOSCRIPT and NOFRAMES, so I'm not surprised at all that it didn't follow your imagemap.