UPDATE ......From Tuesday 8 April 2025 we have changed the way that Single Sign-on works on this wiki. Please see here for more information:
Update
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Skype does not support IPv6 at all . EPIC 
FAIL!!!! Please everybody VOTE FOR IPv6 (<- this link appears to be dead as of January 2012, and the original poll is gone it seems... wonder why that happened...)
I've set-up a poll on http://www.change.org/petitions/skype-add-ipv6-support-to-skype , please vote there so Skype can be persuaded to add IPv6 support
FYI the first request for IPv6 enabled Skype date back to 2004!!
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