With regards to CP2020 and AI, there isn't really much mentioned. There are AI in the game, though the most powerful entity in the Net would probably be Alt Cunningham. She created the beta version of the Soulkiller program, which creates a copy of a Netrunners mind within the Net, an emulation if you will. The Soulkiller was designed to kill Hackers attempting to attack the Soulkillers host network and copy their mind for storage and interigation at a later date.
Saburo Araska, CEO of the Arasaka Corporation, kidnapped Alt and extracted all the information he wanted from her. He then used the Soulkiller on on her so that he could get rid of her body and continue the interigation at a secure location. However, Alts Emulated Conciousness escaped into the Net. This Emulated Conciousness is refered to as a 'Ghost'.
Now, to the OP's question:
How does the GITM idea manifest in the PnP game? What other types of concepts manifest in the game, besides brain dancing?
Also, what are some of your favorite technology-related concepts as it concerns consciousness?
The very existence of Ghosts is only really touched on in the manner I have already described. It is 'currently' a singular occurance, to my knowledge, though there may be more information on the subject that I have not read.
With regards to 2077, I think everything will hinge on how Mike plans to use the events of the Fourth Coprorate War. A virus attacked every database that was connected to the Net, essentially destroying 99.99% of all digitally stored information. There was one database left, in the Arasaka Tower in Night City. That Tower, (and the Database it contained,) met it's end due to a low-yield tactical device that was intended to just destroy the tower set off the internal self destruct device, whcih was a 2-kiloton bomb, (which is only 1/8th the power of the bomb that leveled Hiroshima... Nothing to get too stressed about, Chombata...)
So, depending on how Mike plays it, if Alt survived and so did a copy of Soulkiller, (or one of it's derivatives,) then it would be plausible that more 'Ghosts' would be formed.
The biggest 'other concept' would be the Net. It is not the same as our modern Internet. The manner in which users interface with the Net is the big concept. A manifestation of yourself is used while you are 'online' inside the Net. You effectively put your concious into this 'Avatar' and you have no awareness of what is going on around your physical body. All Programs and Data has a 'physical' representation in the Net, an Icon. These are connected in a similar manner as a road network. Interaction with these Icons, using yourself or programs, is conducted upon this 'map' of grids and shapes. It is very much like a combination of 'The Matrix' and 'Tron'. Though, sisually, more like Tron, but it was the 80's...
Much like GitS, almost everyone has a 'nerural processor', with which they can link into devices and, depending on what other mods they have oinstalled, the can potentially control devices remotely in this manner. Also, just like GitS and Appleseed, full body cyborg conversions are available. But the approach each of these take with full-borgs differes widely:
In GitS, a full body conversion litterally transplants your conciousness into another cybernetic brain. There is no stigma attached to cybernetics and no 'adverse' affects are really discussed. It is hinted at, however, that by mecoming more machine, you begin to dilute your humanity. Another point is that these full-borgs are almost always indistinguishable from a normal human, at a glance.
In Applseed, full body borgs are created around the bodies of their 'host' as a replacement. Their bodies cannot support them any longer and they can only survive in this form. These replacements, while humanoid, tend to be all machine in appearance. They are huge, hulking forms, much stronger and heavier than a human and posess heavily enhanced reflexes, senses and mental faculties. They also feel pain.
In the 2004/2007 films, cybernetics in general carry some stigma, though full borgs all seem to carry the 'burden' of their new existance and often long to be human once more. (Unless they are homocidal manics, in which case they revel in the destructive capabilities.) This stigma is not present in the origional film.
Cyberpunk is very different from both of these. Cybernetic enhancement gives their users a cumulative feeling of being less human and more machine as more is replaced. Full-borgs more than any others. This manifests itself as a feeling of being 'disconnected' from people, a feeling of loneliness. this can escalate to the point where the user flips and goes 'Cyber-Psycho', a mad rampage massacring innocents. The way to avoid this is to recieve therapy. The borgs themselves vary wildly in appearance. Some are almost indistinguishabe from humans while others look more like a tank than a person.
I hope that helps.