When it's time for the curtain call, some people have enough respect to bow out gracefully.
This blog author published over 1,000 posts over five years, and when it just didn't feel right anymore he shut it down with a sign off post. Pretty good way to go.
Orphaned blog: THE BOOK DESIGN REVIEW
Post history: 1,112 posts, from January 2005 to January 2010.
Author: Joseph Sullivan