Activate Features

The list of features you need to Activate from Salesforce is getting longer and longer. This is annoying.

So here is a list of them. Also see https://success.salesforce.com/ideaView?id=08730000000ZWd9AAG

Name	Link	Should I get it	Reason
increase Archive Days	http://help.salesforce.com/apex/HTViewSolution?id=000175889&language=en_US	If you need to clean out old tasks.	Tasks are archived after 365 days by default.
Organization administrators can login as any user	https://help.salesforce.com/HTViewSolution?id=000089838&language=en_US Standard now	YES - if you are a small company/NFP	You need to help users and this is the easiest way to do it.
Multi Currency	https://help.salesforce.com/HTViewSolution?id=000003638&language=en_US	If you need multi currency.
Advanced Currency Management	https://help.salesforce.com/apex/HTViewSolution?urlname=What-should-I-know-before-enabling-Advanced-Currency-Management-with-Historical-Currency-Exchange-Rates-1327108315173&language=en_US	If you need to keep a history of currency.
Create Audit Fields	https://www.salesforce.com/us/developer/docs/api/Content/system_fields.htm Also see http://blog.jeffdouglas.com/2009/04/27/modifying-salesforcecom-system-fields/ Standard now!!! - see User Interface settings	Any time you import old data into Salesforce. Request it for at least 2 weeks.	You need to be able to set the Date Created on standard objects on import
Middle Name and Suffix Fields	https://success.salesforce.com/ideaview?id=08730000000BqVVAA0 Standard now!!! - see User Interface settings	YES - you can always turn it off if you don't need it	You deal with people from the USA, or medical professionals, or military personnel.
Case Age Duration in Business Hours
Follow more than 500 chatter records
Person Accounts	https://success.salesforce.com/answers?id=90630000000gyQjAAI (note the extra steps)	Yes, unless you are an NFP (use NPSP)	You deal with individuals regularly.
Headless Flows (Pilot)	Standard Now		Note: