More Cloud Printing

Google announced Cloud Printing. Now HP announced Cloud Printing initiative as well. That’s exiting, isn’t it?
Besides points of skepticism laid out by Larry Dingan, I immediately start thinking about spam. Would you like your printer to print stupid advertisements without your consent? And while GMail spam filters are close to perfect (I don't hide my address and still getting only limited spam, the same is true for my vkelman.com email protected by Google Postini), still no tools offer 100% spam defense. Of course, Google and HP are thinking about it too...
On another note, it's very interesting to compare HP Cloud Printing initiative to Google Cloud Printing. Both are going to survive, and there will be more (Microsoft, I didn't hear you.) That's good, actually - a competition, pluralism, distributed nature are keys to Web success. So, the critically important requirement would be to develop common and open cloud printing protocols. I hope to be able to print remotely from my Notion Ink Adam Android table on HP printer, and for my supervisor to be able to print from iPhone 4 remotely on Epson printer...