Update?

[Macil]

I haven't had a chance to see any of this stuff or myself outside of this thread or think much about it (I'm at work), but I wanted to post a few thoughts:

• "Beneath stairs, the key to a rare tome can be found. Paired with ancient symbols, letters lurk inside names of my favorite nightmare-magican's dreams."
  

I think the "key/tome" part here has yet to be discovered (unless this is "Inscriptions of the Nile" thing -- was this found underneath some stairs in the game?)

The symbols (hieroglyphs) and letters (posted earlier), in conjunction with the tome, are most likely the cypher for the Omen letter or passwords for the RAR file(s). Nightmare-magician here probably means Frictional Games (and dreams being the games created by FG.) Alternatively, Daniel is a "nightmare-magician" in all the stuff he conjures out of his dreams. Either way, the sentiment is the same, I think.

• "Omen, placed as gift for god of tumbling perfect shapes. It is of no use in our realm, but very much so in its."
  

My guess is that the Omen letter posted earlier pertains to a different game in the Potato Sack and is pertinent to Valve's ARG thing for Portal 2 (no use in our realm, etc.).

• "The murderer's victim spoke of riddles, the answers forming a greater whole. It could perhaps unlock boiling layers inside forgotten memories?"
  

This is probably the sound file posted earlier. I'm guessing "boiling layers" and "forgotten memories" is important somehow -- or it could just mean the RARs are DLC. In regards to the soundfile, of particular note are the questions she asks (names of my favorite nightmare-magican's dreams):

• "The man who escaped death in Grenoble, who is he?"
  
• "Who is hunting me?"
  
• "And, who is the Banished One?"
  
• "I would call on Gabriel to help. You know him - where did you meet him?"
  
• "Where did you leave your sister?"
  

I haven't played the game in awhile, so I can't recall the answers to these off the top off my head. Someone else will have to look them up.

#1. Have to check game notes.
#2. Daniel
#3. Alexander
#4. Brennenburg ? (sp) / check notes
#5. Again, notes!

This is probably relevant in someway (once answered, a "name" may become apparent? which then may relate to the hieroglyphs & letters -- remember: "letters lurk inside names of my favorite nightmare-magican's dreams"):

• "answer my questions and let them make a name for yourself."
  

Cheers.

(p.s., have any of the Penumbra games received updates? I doubt it, just wondering.)
(p.p.s, the Inscriptions of the Nile sound like locations in Amnesia. I'm guessing the hieroglyphs/letters were found here?)
(p.p.p.s, I think it was already pointed out, but the initial letters of "Random Arbitrary Ramblings" are "RAR", heh.)
(p.p.p.p.s,

• "A certain permutation can form something encapsulating all, but is not the answer. The numerical order, where hidden trumps shown, must be used! Do not gaze at the face! It is not of here, but should reside elsewhere."
  

This may mean that not all the hieroglyphs / letters will be used. "Where hidden trumps shown" means that whatever is hidden overrides whatever is shown. "The numercial order must be used." Someone better at math than me might be able to see some patterns in the appended numbers, or perhaps it is the order in which they appear in the game--this doesn't "feel" right, though.

Also, the Omen probably forms some kind of image or piece of of an image file that looks like a face -- and is again for Valve's ARG and not pertinent for the RAR files.

edit: http://valvearg.com/w/images/1/15/Connection_invert.jpg

This looks like a face, doesn't it?)