Some older (and thus well hung) news snippet on this issue:

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Originally posted on: theforce.net -- More on Sam and Max 2 Petition
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Less than a week after the LucasArts announcement that it has stopped production on "Sam & Max: Freelance Police" a Save Sam & Max Website was launched. It has just undergone a huge redesign facelift. The Site is dedicated to forcing LucasArts to reverse their decision and have Sam & Max 2 finished and released. There was a lot of frustration, anger and resentment after LucasArts shock announcement and the creator of http://www.savesamandmax.com wants to "harness that in a productive way."

"The campaign to get this game reinstated has just begun, as a petition exceeds 20,000 signatures, we have protest being organised for E3 2004. We also are encouraging everyone to mail their own piece of Sam & Max Fan Artwork to LucasArts to let them know their are Sam & Max Fans out there who would buy this game, contrary to whatever flawed research they have done. I think its also time for the gaming community to take a stand and let companies like LucasArts know we want original and funny games like Freelance Police. I also challenge Mike Nelson who cancelled the game with that pathetic two line quote, to come out and respond to the fans passionate showing of support for the game."

- SaveSamandMax.com
After just going through a resdesign, SaveSamAndMax.com continues in the tireless job of trying to convince LucasArts to un-cancel the Adventure Game. The petition has over 20,000 signatures, a protest is in the works, and I have a feeling that whoever is at LucasArts reading the PR e-mail is putting in some long hours.

Many people are wondering, what one can do to help out. Well they have a whole section devoted just to that, with ideas from protesting at E3, sending letters, to even pre-ordering the game where you can find it.