Wednesday, May 7, 2008 is Free Printer Ink Day at Click2ink, one of the leading online stores for ink cartridges and toner in the U.S. For one day only, Click2ink will provide one ink cartridge per household for free.

To qualify for the free cartridge, visitors must sign up for Click2ink's newsletter before May 1, 2008. A coupon will be sent which can be used on May 7 to claim the free ink cartridge.

In addition to the free cartridge offer, Click2ink offers free shipping on orders over $55 US within the continental United States. Use coupon code SAS5 to get 5% off any order with no minimum purchase necessary.

Recently we reported on the thINK FOOD program which allows Canadians to donate to local food banks by recycling inkjet cartridges and cell phones. Now the United States Postal Service has announced the Mail Back program allowing U.S. citizens in select cities to mail their used inkjet cartridges, mp3 players, Blackberries, digital cameras, and other electronics to be recycled.

The program is being tested in ten cities, including Washington, D.C., Chicago, Los Angeles and San Diego, and may be expanded if the program is successful. Citizens can pick up free mailing envelopes at USPS Post Offices. The used electronics will be shipped to Clover Technologies Group who will recycle the parts and sell remanufactured products.

HP is showing off the technology behind its forthcoming product lines. PC World reports on two innovations that HP is demonstrating even before it has products with which to sell them.

First is HP's latex ink, a water-based ink designed to withstand weather. Products using latex ink will be targeted at businesses who create outdoor displays, such as billboards and signs. The ink will survive for up to three years outdoors and unlaminated, and up to five years indoors and under direct sunlight. Whether latex ink will be used in consumer products was not announced.