I have the files from the February run for en wikipedia converted here:
http://dumps.wikimedia.org/other/experimental/
In the sqlfiles directory are the page, revision and text tables in sql format for MediaWiki 1.20, and in the tabfiles directory are all the tables needed or a mirror (I omitted images, oldimages and a couple others) converted to tab delimted format for use with LOAD DATA INFILE for MySQL.
The contents may be garbage etc. etc. so be forewarned. Please check them out and let me know how they are.
While I'll leave the files there for awhile, they won't be there forever, so don't be surprised if in the future they disappear.
Missing is a script to write the tab delimted files to a fifo in reasnably sized chunks. I am told that percona has something like this if it turns out to make a difference in import speed/memory.
Don't forget to make sure your client and server character sets are set up correctly, that you've disabled foreign key checks etc. etc. before attemptgin to shovel the data in.
Happy trails,
Ariel