Nikon D7000 backfocus problems - some links

There are some pretty smart guys out there who has the same problem with their Nikon DSLRs i.e. back (or front) focusing.
I've found couple of really interesting links in which I could get more understanding of this problem and some is already suggesting a way to fix it. I just list the links below and I hope those guys don't mind if I use their URL and suggest their great sites

• D70 (!) backfocus problem, how it works and how to fix it at home
• The same link as above but with slightly different content
• Very smart and easy to use focus test chart to download (pdf)
• D90 (!) backfocus issue (hungarian)