MetaWiki

Meta Wiki Search Engine: http://sunir.org/apps/meta.pl

MetaWiki

An IndexingScheme for many wikis, not just one wiki. Along similar lines to TwinPages and InterWiki. Allows titles searches on multiple wikis at once. Only known, supported wikis will be searched, however.

lets get indexed,too

also - check out http://www.worldwidewiki.net/wiki/SwitchWiki for a list of public wikis.