Lost Theory Question #2: What Are The Whispers?

First mentioned by Danielle and heard by Sayid in "Solitary," the whispers are a mystery never fully explained. Lostpedia has transcripts of them all and, looking closely at them, it seems like someone on the island is watching our favorite castaways. Here's what they said in "Solitary":

Male Voice- "Just let him get out of here"
Male Voice- "He's seen too much already"
Male Voice- "What if he tells?"
Female Voice - "Could just speak to him"
Male Voice- "No"

And here's a sample of what Sawyer heard in "Outlaws":

"Oh my god there's a guy out there"
"Dennis find out what's going on"
"Did he see us?"
"Maybe"
"Open it"
"Did you see what direction he went?"
"Right through those trees"
"Go and get him"
"There is [an explanation/a resolution] and I bet you haven't thought of it"
"What is it?"
"He's been in a plane crash"
"Are you sure?"
"I know what it's like for a plane to crash"
"Complain, complain, complain"
"I want to get closer"
"I know what you said, but he's looking around"
"What if he shoots us or something"

Now these transcripts suggest that 1) someone or something is watching them and 2) they always seem to be nearby, camouflaged or hidden, perhaps suggesting someone with some Predator-like cloaking ability. Since they're worried about being shot, they appear to be mortal at the very least.

But from the Blast Door Map, itwas suggested that DHARMA some sort of remote viewing/listening station that the Others eventually took over. Some samples:

• High potential for R.V.S. Facility
• Interference might also prevent location use as listening station/cryptography research/communications analysis facility

However, the Flame didn't seem to have that sort of capability. And while the notation could have referred to the Pearl, it certainly wasn't used for any sort of cryptography research or communications analysis. Not to mention, Radinzsky and Kelvin could just have been wrong about the facility - perhaps even having heard the whispers themselves and assuming it was DHARMA watching them.

So could the whispers have been Jacob and others like them? He seemed to (creepily) whisper at Locke in his cabin. Could the original inhabitants of the island (who conducted a guerrilla war against DHARMA) be able to hide themselves in the jungle and have some sort of telekinetic ability to communicate? We also know the Monster is able to telekinetically communicate. Maybe it's something like Legion - watching and communicating within itself. Perhaps all the missing dead bodies of everyone on the island live on within the Monster and communicate with each other.

What say you? Are the whispers DHARMA, the natives, Jacob, the Monster, or something totally different?