The default interwiki map at https://github.com/wikimedia/mediawiki/blob/master/maintenance/interwiki.list should be updated to remove dead or less-used sites:
Not on Meta interwiki map:
gentoo-wiki kmwiki openwiki seattlewireless "wiki" (pointing to WikiWikiWeb?)
Recently removed from Meta map:
FoxWiki LinuxQuestionsWiki
Pending removal from Meta map:
dwjwiki s23wiki DrumCorpsWiki C2find advogato cache TmNet WikiF1 Unreal dwjwiki HammondWiki Squeak Baden
Updated on Meta a while ago:
memoryalpha metawiki wikia wikinfo
Update requests pending on Meta:
usemod dictionary (potentially controversial) TMBW