Here is a funny but decidedly creepy new commercial from Microsoft (MSFT), in its ongoing marketing campaign to push its Bing search service.

In the commercial, below, titled “Vampire Decision Engine,” the software giant taps into vampire mania, playing into Halloween and the next chapter in the “Twilight” movie series, “New Moon,” set to debut in November.

In it, an Edward Cullen type, aided by a comely young woman, is looking for a place to “eat.”

According to Bing’s blog, it’s one of a new series of television spots in its $100 million marketing campaign.

The creative is different from earlier commercials, which featured search-overloaded people spouting keywords.

“Our latest Bing advertisement is the first in a series of new commercials where we highlight specific ways Bing can help simplify your life and help you make decisions faster,” said Bing in its blog.

You can see more video on Bing’s YouTube channel, owned by, yep, Google (GOOG)!

The video has a star-studded cast, all singing Marc Shaiman’s “Prop 8–The Musical,” including Jack Black (as, um, Jesus), Neil Patrick Harris, John C. Reilly, Margaret Cho, Allison Janney and others.

It’s set as a musical being presented by the Sacramento Community College Players.

Prop 8, a ballot initiative passed in the November election in California, eliminated the right of gay and lesbian people to marry by overriding a state Supreme court decision and changing the state Constitution.

It is currently undergoing legal challenge.

In any case, this video is very funny, especially the part about shrimp cocktail:

Please see this disclosure related to me and gay marriage.

One of the more interesting developments of this election cycle has been the boom in viral online videos being used–from a plethora of political spoofs of the candidates to educational videos to people simply venting.

And those pushing citizens, especially young people, to register to vote have been using the boom in online video too.

Last week, BoomTown featured one effort by a passel of celebrities to snarkily get people to vote by telling them not to (but not really).

This week, actress Jessica Alba turns into a Home Shopping Network maniac by hawking “The Muzzler,” for those who don’t vote.

It’s a lot over the top–including featuring a pink muzzle on indestructible “Heroes” cheerleader Hayden Panettiere.

But it does get the point through like a sledge hammer that it is important to vote in the Nov. 4 election.

Alba has already posed for several shocking pictures for the group doing the video–Declare Yourself, a national nonpartisan group dedicated to getting young people to vote–including wearing a muzzle and being bound by electric tape.

So, whoever you plan to vote for, here is a list of deadlines to register to vote in the 50 states, with many being today and the rest of this week.

And, here’s the Muzzler video: