Regular readers of this column and Lyra's The Hard Copy Observer will remember that I wrote a column about a company (and product) named GreenPrint just recently, but that's about a "different" green -- using less paper and other supplies (ink and toner) when printing.
I know from personal experience that HP has been an Energy Star leader since the early 1990's but I will endeavor to learn more about where its latest home and office printers fit with the new 4.0 regs. And I'll try to find out about other manufacturers as well. So stay tuned! (Or leave a comment if you have more information.)
In the mean time, here's an interesting link I found this morning to an article about the California state building in Sacramento that's gone green. The printer-related quote:
But a campaign to reduce the number of computer printers in the building -- thereby saving on paper, electricity and cartridges -- is evident only to the employees who have given up the luxury of printing documents at their desks.