DB Health Check

Thanks to The Human Fly via Twitter @sjaffarhussain I see that Oracle Corporation have a published note onHow to Perform a Database Health Check. (Note 122669.1). I read this with some interest as this is something that I do quite frequently as part of my day job. Here is the contents list of that note.
1. Parameter file
2. Controlfiles
3. Redolog files
4. Archiving
5. Datafiles
5.1 Autoextend
5.2 Location
6. Tablespaces
6.1 SYSTEM Tablespace
6.2 SYSAUX Tablespace (10g Release and above)
6.3 Locally vs Dictionary Managed Tablespaces
6.4 Temporary Tablespace
6.5 Tablespace Fragmentation
7. Objects
7.1 Number of Extents
7.2 Next extent
7.3 Indexes
8. AUTO vs MANUAL undo
8.1 AUTO UNDO
8.2 MANUAL UNDO
9. Memory Management
9.1 Pre Oracle 9i
9.2 Oracle 9i
9.3 Oracle 10g
9.4 Oracle 11g
10. Logging & Tracing
10.1 Alert File
10.2 Max_dump_file_size
10.3 User and core dump size parameters
10.4 Audit files