I added an article I wrote a while ago about the Turkish I issue: http://www.gotdotnet.com/team/clr/bcl/TechArticles/techarticles/WritingCultureSafeManagedCode.doc

I also started some FAQs for DateTime and the numeric types. These are short right now, but we expect these to be updated over time.

http://www.gotdotnet.com/team/clr/bcl/TechArticles/techarticles/datetimefaq.doc

http://www.gotdotnet.com/team/clr/bcl/TechArticles/techarticles/numericsfaq.doc