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[edited by: tedster at 6:02 pm (utc) on Mar 25, 2011]
[edit reason] repair format problem [/edit]
For best results, make sure you use 301s in a technically sound manner:
However, errors in the canonical tag can also create a disaster so again, technical precision.
[edited by: realwahl at 4:45 pm (utc) on May 4, 2011]
Google has supported the cross-domain rel="canonical" link element since 2009.
AFTER redirects are in place include BOTH the new pages AND the old pages in your sitemap. Let Google see the new but ensure they see the old and can learn about the 301's. When the old url's are out of the Google cache you can remove them from your sitemap.