Here are my Wikipedia records.
Most articles created in one day:11 on July 24 2008.
Most articles created in one month:15 in July 2008.
Largest article created:Music of Chicago is about 175000 bytes or 17.5KB as of February 12, 2009
Article with most references:Roseland Public School with 18
Most edits in one month:500 edits in September 2008
Least edits in one month:6 edits in January 2009