Working with Harris, I verified that Google Apps has been using 1024-bit domain keys since at least December 2011.

FORBES: Google Says Google Apps Domains Were Protected From Massive Spoofing Vulnerability

Harris said Gmail also appears to have been using 1024-bit domain keys since at least around that same time frame.

FORBES: Google Says Google Apps Domains Were Protected From Massive Spoofing Vulnerability

Now the first bit of content is in the public domain, social and atomic.

FORBES: A Sketch of a Storify: What New Tools Tell Us About Supply and Demand for Content

More and more people now use domain-name shortening services such as bit.ly and econ.st (The Economist's such offering).

ECONOMIST: Internet governance

Meanwhile, since Harris sent his email to Larry Page, Google has doubled down on the strength of their domain keys and now uses 2048-bit keys.

FORBES: Google Says Google Apps Domains Were Protected From Massive Spoofing Vulnerability

Bit.ly also offers users an alternative called j.mp, the domain of the Northern Mariana Islands, which come under American law.

ECONOMIST: Shortened web links are convenient, but they come at a price

To prevent bitsquatting, Dinaburg recommends that major domain names like eBay, Microsoft, Google, etc register the available one-bit permutations of their names.

FORBES: Bitsquatting: Machine-Garbled Internet Connections