For whatever reason, you might find yourself in a situation where you need to disable IPv6.  For me, it was to troubleshoot a problem being caused by IPv6 being enabled.  Pretty simple solution provided by Microsoft:

http://support.microsoft.com/kb/929852

It seems lately we've been doing a number of Exchange migrations and we're seeing the dreaded "Security Alert".  In a nutshell, the server has an internal name which does not match the external name to which the certificate was assigned.  When the Outlook client is remote to the server, everything works as it should.  But when the Outlook client is internal, the user receives the following error:

It could be an obsessive compulsive trait or ... ah... who am I kidding.  I'm OCD and I have this need to clear the screen of anything that isn't part of my current process.  In Windows, the command is CLS, in Linux, the command is clear.  Pretty basic commands but in Linux there's a slightly fancier version which allows you to clear the line while in the midst of typing out a command by simultaneously pressing:

Ctrl L

Simple but helpful when you're in the middle of a long string.