Google Analytics will soon include Change History, a log of account changes

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View the history of account changes

The Change History is available only to users who can perform administrative tasks.

Analytics now includes Change History, a list of user activities in Analytics so you have a record of who did what when. For example, on Monday, January 7, at 14:28:25 PDT 2012, UserA@gmail.com created the new profile User A’s Profile.

There is a new Change History tab at the account level, alongside the Data Sources and Account Settings tabs.
The Change History lists:

• Date column: The date and time of the activity
• Email column: Which Analytics user performed the activity
• Activity column: The Analytics object (e.g., account, user, profile, goal, filter), and what activity was performed on the object (e.g., added to account, created, deleted)

using this information you can investigate things like who added filters to my default profile, when were those new users added to the account, or who deleted the regex include filter I spent all week writing? Rather than wonder if something just mysteriously changed or disappeared, you can open Change History to see exactly what happened when, and who was responsible.
Change History maintains a record of activities for the last 180 days.

For more information please visit: 
http://support.google.com/analytics/bin/answer.py?hl=en&answer=2949085&topic=1009690&ctx=topic