From SEO Best Practice

Various useful bits and bobs

Google Analytics graph annotations

A must for keeping track of what you do and how it affects your website data. Keep it up to date with offline and online marketing efforts that can affect your traffic. This allows you to understand e.g. what effect your TV ad had, when you look back in a year's time. You can star important analytics notes. Its handy to encourage everyone on your team to update the notes

• http://analytics.blogspot.com/2010/01/annotations-now-available-in-all.html

Removing the All Visits segment line from a segmented view in GA

• find this again :P

• &seg0=-1

References

SEOmoz 7 advanced segments with regular expressions