Good question...

Daily? Ha, consistency makes me laugh.
Anyway, how to kill Rebecca Black, Justin Beaver, Charlie Sheen, and Dora all at once? There are many ways I can think of...
[Beware, this may become graphic.]
I quite like Charlie Sheen, but I will not refuse a challenge!
Okay, here's a bullet list of the short responses:

• Head-shot with a really long and really sharp arrow against a brick wall. Nyes.
• Hire the mafia. They'd probably do the job for free.
• Lemme at 'em with a chainsaw and a fake identity. Woo-ee!
• Make Obama pass a law that anyone that sucks is allowed to be killed. The public wouldn't hesitate a moment.

The more elaborate plans:

• Have the latter two listen to a duet by Black and Beaver. Let them have their last moments (before their brains literally drown in ear-blood) to ambush the offending, ahem, "singers."
• Lock them in a room together and don't let Charlie drink Tiger's Blood. [A.k.a., some type of drug mixed with alcohol.] See what happens. (If all else fails, get GLaDOS to fill the room with neurotoxin...)

Individual plans:

• Dora: Give Swiper some coffee and a knife, and tell him "You gonna let that be-yotch tell you not to swipe? You gonna listen to 'er when she does?" Maybe he'll push her off the ledge of that video game she starts every show in...
• Charlie Sheen: Why bother? He may OD any second...
• Justin Beaver: Best way is to get his mother to ground him from playing with his other twelve-year-old friends. Make sure he's equipped with a noose, a razor blade, and a really heavy chair at all times, along with a list of the comments on one of his music videos... Watch the events unfold. 
• Rebecca Black: Don't let her have her bowl or her cereal. (Or you could just let her underage friends drive her around more...)

Black, 13, recently granted her first interviews since going from obscurity to Charlie Sheen-ousting Twitter trending topic. And in a sit-down with Good Morning America, the eighth grader said she wants at least one good thing to come out of her rash of exposure. Apparently Black is hoping and wishing to duet with Justin Bieber. -Rebecca Black to Justin Beiber- Would you do a duet with me?

Maybe getting them together won't be too hard...first step down!