Each snake is an individual and each can exhibit individual behavior patterns, but none are very personable in my experience. They do not exhibit as much 'personality' as would a rat, nor do they seem social. (There has been a recent study though that suggests that Timber Rattlers are quite sociable.) They can come to recognize certain things that often makes them seem more personable. If you feed them at the same time on the same day of the week, and while wearing the same shaded outfit (for instance a white lab coat) and they will come to recognize feeding time and the lab coat and may act appropriately at feeding time. As for crawling up on an arm, some will do that too. Some people swear such behavior is due to the personality of the snake, and that the snake is showing a bond or affection and I guess that is possible. I wonder, though, if this is an expression of affection so much as it is a response to the arm being placed into the cage and that same arm being associated with two things the snake likes: food and warmth (body heat); and/or is it simply the snake trying to get out of the cage. Of course this is due to the 'personality' of the snake because some do it, while others of the same species will not do it, therefor it is a 'personal' trait.
As for the attractions to the computer, it may be the warmth. Is this attraction when the PC is turned on. be careful, snakes have been known to actually squeeze into a PC through the fan vent, and this would be disastrous for the snake if the fan is on. As to the phone, well maybe it is more sociable than I would have thought - watch out for that wireless bill! That one really has me stymied. I cannot really figure why that would be. As for shadows, that could be because of a natural drive. Snakes seek out dark places in which to hide. They, in a natural setting, spend a lot of their time in hiding places avoiding predators. This, of course, speaks at the importance of hide boxes in the snake's enclosure. The choice of name you selected is pretty appropriate and sounds like a good one to me.
You will have lots of time to enjoy your snake. Average life span for a captive bred corn snake, that is well cared for in captivity is probably about 15 years. Note I said average life span; I am sure some could live to be a lot older. According to the National Zoo in Wash., DC some have lived to be as old as 23 years. (See
National Zoo Corn Snake Facts The Audubon Society, in their Field Guide to North American Reptiles And Amphibians, states the longevity record at 21 3/4 years, but this information is already several years old. Others on the net claim a life span up to 25 years. Whatever the case as to longevity, even looking at an average life span of about 15 years, you can see you have a long term commitment on your hands. Sybella made a great point that you will learn about each other mutually, and you have lots of time in which to do that so long as you care for it well.
My guess is that you will probably get some more corn snakes before too long. They are one of the most beautiful snakes in North America, and the world. They come in lots of color variations too, and this makes for an interesting collection. They are also among the best snakes for the beginning keeper. I don't know if you are new to snakes (you said this is your first corn, not your first snake), but if you are a new keeper, you made a very good choice in snakes. Good luck.
Best regards,
Glenn B
All in all, you will "learn" your snake just as much as he or she will "learn" you...it's mutual training. 