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leadegroot - 12:11 am on Aug 15, 2006 (gmt 0)
(Sidenote: bear in mind that there is a strong school of thought that says that if your sites are so similar in theme that you want to run the same blog on all three, then you really only have 1 site, so it should all be under the one domain name to reduce your SEO/marketing efforts!)
The first technique that popps into my head is to host the blog on one of the sites and include excerpts on the other 2 sites, where the 'read more' would click through to the hosting site.