I agree with everything except the Source Code... I really don't bother.
What I find important to add is:
- Document => we keep a template which we can complete with the most important things that we need to know about the system (eg: backup, logins, known issues, etc)
- passwords and security in general, is it set up? Who has the passwords, what privileges and do they need it? Let's face it, if there's someone else running around with dba privs, then who is responsible for the DB?
All in all a good blog.