I've set up Wiktionaries for all 146 languages that have a Wikipedia. There's known teething problems, however they should be good be working well enough now for people to get started. The most important problem is that many languages have a project namespace of "Wikipedia" (or the transliterated equivalent), but the interface messages point to "Wiktionary". I suggest that for the time being, people should put pages in the real Wikipedia: namespace, and set up redirects from the Wiktionary: pseudo-namespace where necessary. Wiktionaries with no language file, or with language files which use $wgMetaNamespace, do not suffer this problem.
The MediaWiki namespaces have been copied from the associated Wikipedias, with the local term for "Wikipedia" replaced by "Wiktionary".
To request adminship or bureaucratship on the new wiktionaries, go to:
http://meta.wikipedia.org/wiki/Requests_for_Wiktionary_permissions
I've set up a few basic kinds of interwiki links, which may be expanded or modified in the future. The "w:" prefix should link to the Wikipedia in the same language. Language prefixes link to other language Wiktionaries. To link to a different language Wikipedia, use [[Wikipedia:xx:Page]].
This brings the total number of wikis to 298. There's a few technical and administrative changes which occurred to make this happen. Stewards should know that they can change the rights of users on the wiktionaries by appending "wiktionary" to the language code, e.g. "Tim Starling@frwiktionary" . Wikis such as sources and sep11 can now only be accessed by appending "wiki", i.e. metawiki, sourceswiki, quotewiki, sep11wiki and textbookwiki.
Another change is that the English Wiktionary has moved from wiktionary.org to en.wiktionary.org, bringing it into line with the rest of the wiktionaries and with Wikipedia. There are redirects of course, so links won't be broken. The only links that were broken during the construction of these wikis were images uploaded to the English, French or Polish Wiktionaries. The directory layout was rearranged to minimise the overhead per wiki.
-- Tim Starling