I wish more people were doing code reviews... It's hard enough to get people to read my code when I volunteer it, let alone permit me to peek at theirs! Of all kinds of artifacts, such as SSIS packages, schemas, cube designs, not just C#.
Mark's got some good, non-traditional tips for conducting useful, productive code reviews:
Code reviews. Stay awake at the back there (marklon @ MSDN)
I'm sure that I'll want to find 'em later.