Its like I have an encyloapedia I cannot easily access, someone will say something and I will be like I know about that... full of useful and useless and seemingly useless information.
Me too but I need that trigger. (Visual is better) Without that, the information stays locked up. Only details on my current interest(s) and a certain amount of data I use in daily life is available to me consciously. Makes for nice surprises when I stumble across things (books etc.) I had not remembered I had, and that triggers a whole re-discovery of "lost" treasures because suddeny I remember lots of other things my brain somehow stored with that item.
Also have a habit of remembering things people say word for word.
I sometimes do, but again I couldn't repeat it if you asked me "What did I say about this subject when we last spoke?", yet if you said the same thing again but worded it differently, I would instantly recall the precise wording you used and would usually not be able to stop myself from correcting you.
Excellent long term memory, kind of like an elephant!
For me only for spatial and some visual stuff. I can remember the layout of every place I've been to since I was about 1 1/2, the feel of the space around my body, where the doors and windows are, where the bathroom is etc.
Also the smells and textures and materials, what they tasted like (or would have tasted like, had I tasted them, e.g. my brain stores the fact that something is made from "wood" as the sensation of wood as I grew up to know it, taste, smell, texture and all), and certain visual aspects but always in fragments.
It's almost as if my brain only takes in one fragment at a time visually, and so it has learned to store things using other senses instead, spatially, with the sensory associations attached to the rough spatial shape of things.
That's one thing I realised lately, I always thought "But I do use gestures a lot". However, I use gestures almost like a sign language to keep myself on cue when I am talking. So if I am talking about a cup, I often end up shaping a cup with my hands and glancing at it briefly before continuing. I realise now that this may appear odd to others, but without it my sentences get muddled and trail off halfway through.
I read what Donna Williams said about "talking through objects" (using objects to represent things you are talking about, to help keep meaning in what she says) and I always thought "I could never do this, I couldn't keep track of what each object stands for!". But actually, it doesn't need to be a continuuous representation, it's enough just to have that brief visual feedback to the words coming out of my mouth.
I read just about anything and absord it, even shampoo bottles, I read my mum's midwifery books, dictonaries, phone books as a kid often for no apparent reason.
Yup, me too, my Dad's medicine books (his interest is in medicine especially natural remedies, he is a barber and his older customers really appreciate the tips and remedies he sometimes gives away. Nothing dangerous, just stuff to rub on stiff joints etc.) were my favourite books before I got my set of encyclopaedias which were old-fashioned but well-illustrated.
I was delayed in speech until 4
I didn't have a speech delay (started at ca. 14 months, which my parents considered "very early") but only repeated stuff and didn't use speech for communication until I was around 3 1/2 to 4 (when I became aware of letters, and then it "clicked"). Although I still have trouble with sequencing sounds in speech, far, far less so in writing.
I was really, really lucky because I was enroled in a special education kindergarten for the next 1 1/2 years, a school for children with motor and visual disabilities, where basically every day was useful, sensory-oriented all-round "therapy". I was there as a "normal" child but with hindsight I dare not think about where I'd be at if it hadn't been for that time.
At the moment I am having trouble reading thinks a concentration and auditory thing, I seem okay to absorb 3 magazines in the doctor's surgery whilst listening to my mp3 player. Just not relaxed enough to sit with a book at home, too much distraction.
I always have phases where my brain is "chewing on" information and I just cannot take in any more information. I read but it doesn't make sense until much, much later. Then a few weeks later my brain starts forming conclusions to things I was never aware it was thinking about.
There are phases where I absorb and read non-stop, but cannot consciously process or respond. Other times I cannot absorb new things but can and almost "have to" express those newly formed views I had never known I was forming.
All my life I have worked best when part of my brain was occupied with noise, I can read so much bettter that way, and think better. As a child I used to hum and later sing to myself constantly, nowadays it's the MP3 player. (I did have a few audio cassettes that I loved to listen to over and over, but I go through phases where I can't take in audio stories, similar to how I am with reading sometimes)
There goes again I am smelling things that are not there again. Either that or my pc is over heating. Damn I have no one to check whether I am smelling what ever I am smelling. Did it at work, my colleague could not smell what I thought I smelt. Maybe I need a bath!
LOL... that's quite characteristic of epilepsy (temporal lobe I think?) but it could be your PC! 
Anyway sorry for hijacking your thread!