Roswell
The 2000 campaign to save Roswell was the first of many to involve food items particular to the show's characters. Because the aliens on the series sprinkled everything with Tabasco sauce, fans sent 6,000 mini bottles of the spicy condiment to UPN execs after hearing about that it would not be renewed after the first season.
Result: Success!
The Tabasco plan worked, and Roswell got two more seasons before being permanently axed in 2002.

Firefly
Fox played fast and loose with Firefly's timeslot and promotion from the get-go, and announced the series' cancellation mere months after it premiered in 2002. Outraged fans, dubbed Browncoats after the show's similarly-named heroes, raised money to buy an ad in Variety and sent thousands of postcards to Fox execs.
Result: Mixed
Fans couldn't save Firefly from cancellation, but closure came in the form of the feature film follow-up, 2005's Serenity.

Jericho
After CBS announced its decision to cancel Jericho in May 2007, fans rallied around beloved character Jake Green's cry of "Nuts!" and sent some -- specifically, 20 tons of peanuts -- to network execs.
Result: Success!
CBS responded by commissioning seven more episodes as a mid-season replacement in 2008.

Veronica Mars
The CW axed cult hit Veronica Mars in May 2007, and fans inspired by Jericho's success with sending food items promptly sent 10,000 Mars bars (get it?) to network offices. Fans also sent in fake $2 bills with "Veronica Mars Is Smarter Than Me" written on them (inspired by a trick done by Veronica herself in an episode).
Result: Failure
All the chocolate and fake money in the world couldn't convince The CW to keep VMars on for a fourth season.

Journeyman
Fans used food yet again when they sent boxes of Rice-A-Roni -- inspired by the show's location in San Francisco -- to execs, after news that NBC had declined to renew the series broke just a few months into the show's first season.
Result: Failure
Apparently the suits at NBC weren't fans of The San Francisco Treat, because Journeyman was not renewed.

The 4400
Food items inspired by the show's characters continued to be a favorite mail-in item in January 2008, when fans of The 4400 sent in sacks of sunflower seeds (a favorite snack of character Dr. Burkhoff) after USA Network announced it would not renew the series despite a cliffhanger ending to the fourth season.
Result: Failure
Fans will never find out what really happened to those unfortunate abductees.

Moonlight
The food trend got bucked in March 2008, when rabid Moonlight fans organized blood drives in honor of the show's vampires to convince CBS not to cancel their favorite series.
Result: Failure
Though it was an incredibly noble protest, it wasn't enough to save the show.

Reaper
In honor of sidekick Sock, fans sent (you guessed it) socks to The CW after the WGA strike made Reaper's fate uncertain in May 2008. Star Bret Harrison conceived the sock idea, posting it on his website along with The CW's address.
Result: Success!
Fans succeeded in getting their beloved series renewed for a second season! But the fate of Season 3 is currently undecided.

October Road
ABC cancelled October Road in May 2008 despite a second season cliffhanger ending. Fans then launched a "Pay October Road Forward" campaign in which copies of the Season 1 DVD were donated to local libraries, in order to get new viewers hooked and increase potential ratings for a third season.
Result: Failure
Guess libraries aren't the most popular place for renting TV on DVD, because October Road was denied a comeback. But viewers will be able to get (some) closure with a fifteen-minute finale episode included on the soon-to-be-released Season 2 DVD.

Kyle XY
In January of this year, ABC Family announced its decision to cancel beloved sci-fi series Kyle XY, and fans responded by jumping back on the sending-food bandwagon and mailing Sour Patch Kids (Kyle's favorite snack) to executives.
Result: Failure
Despite the delicious candy, ABC Family went ahead and canceled Kyle XY, though writer Julie Plec did provide some longed-for answers in an interview where she revealed what had been planned for later seasons.

After Jericho, networks have basically ignored campaigns that involve food as a plea. But since Chuck's Save-Our-Show campaign revolves around spending money on an advertiser's product rather than simply mailing in absurd amounts of snack food, and because Chuck is merely on the bubble and not officially cancelled, fans may have more of a shot at getting a renewal for their favorite series. After all, the way to a network's heart is most likely through its budget.

Still angry about your favorite show's cancellation? Got a message of hope for Chuck fans? Sound off in the comments!