The fix for feature request 1560566 [1] has changed the way xmlpeek returns value when XPath refers to an XML node, not text() or attribute.
0.90 and before - XML of the node was returned
0.91 alpha 1 and after - "Value" of the node is returned, making it impossible to use XmlPeek + XmlPoke to copy-paste XML between documents.
[1] https://sourceforge.net/tracker/index.php?func=detail&aid=1560566&group_id=31650&atid=402871
Please move this into Bugs - it's not a feature request, I took the wrong tracker.
Fix was just committed to cvs and should be in the next nightly/release.
10-17-2011 Nightly snapshot contains the fix.