SEO links from wikis

Wikis are an excellent tool to generate inbound links, here are a list of the most important wikis:

atwiki.com
bluwiki.com
communitywiki.org / odd
editthis.info
grou.ps
intodit.com
intodit.com
mediawiki.org
meta.yourwiki.net
myfreewiki.net
netcipia.net
on-wiki.net
openwiki.com
picowiki.com
referata.com
referata.com
seedwiki.com
wikia.com
wikidot.com
wikihost.org
wiki-site.com
wikispaces.com
wikispot.org
wiki-wiki.ru
wikyblog.com