Meta.stackexchange.com now redirects here, at meta.stackoverflow.com. The discussions held there were not migrated. While most of those discussions were specific to SE 1.0 sites, there are many discussions and feature requests that ultimately made their way into the SE 2.0 sites we are using now.
Further, there are discussions of historical interest contained in that old site.
I would appreciate it if Stack Exchange, Inc, would consider making a meta.stackexchange.com data dump available for download.