The iPod classic is no longer on sale after Apple quietly discontinued the product yesterday. It shouldn't be much of a surprise to anyone given that the product hasn't been refreshed since September 2009 - five years ago, but as the direct descendant of the original iPod, it signals the end of an era to a certain degree. The iPod shuffle, nano and touch remain on sale, at least for now.
We've charted the key product milestones of the iPod classic line above (view the full resolution version), with thanks to the thorough Wikipedia entry on it. If you're after a bit more of a visual history of some of the major changes to iPod classic, head over to The Verge.