It is a 4 core computer with Hyperthreading technology. Due to that the computer Identifies 2 processors for every core on the computer. It is normal, however having that feature enabled can detriment the computers performance for non-multithreaded applications.
not specifically Hyperthreading. Yes its same in essence but it is better. In fact the performance loss has been shown to be minimal compared to the old HT that would cause some pretty big performance loss in a wide array of apps.
But in the current software state, almost everything supports some sort of multithreading and even games are catching up and by the time a Core i7 becomes obsolete (say 2012, end of the world and all) every program will use at least 4+ cores.