Indeed, Berlin is now Europe's liveliest city after sunset.

ECONOMIST: Berlin

For Nextel push-to-talk subs, the writing's been on the wall for some time now, what with that legacy service destined to sunset on June 30th, 2013.

ENGADGET: Sprint plans $10 monthly charge for iDEN push-to-talk subs in the new year

The indoor lighting levels in their enclosures now simulate those of natural light levels, in line with sunrise and sunset.

BBC: Fertility tests begin on pandas at Edinburgh Zoo

Among the products Google just announced it plans to sunset (read: kill off), beloved feed-reading service Google Reader is now on the chopping block.

FORBES: Google's Strange Attack On Bloggers And The Public Internet: The Massive Reaction To Reader Shutdown

Buttonwood has been a fan of ultra-long bonds until now, warmed by the image of a generation of oldsters wandering off into the sunset clutching their perfectly tailored, income-generating, supercreditworthy bonds.

ECONOMIST: Buttonwood

Bonus depreciation and increased expensing expire after 2004 and 2005, respectively--a sunset that arguably makes sense if the point is to stimulate the economy by encouraging more business investment now.

FORBES: Magazine Article