Mind you jetmech1 that your previous Laptops were from a time when Dell didn't do much at all to differentiate Latitudes from Inspirons. Your 8600 was a Latitude D800 with media buttons on the palmrest and no trackpoint on the keyboard (different BIOS too). Dell saw no reason to remove the docking connector from the system because it'd mean lower costs since both systems would have almost identical motherboards.
Now Inspirons and latitudes share no parts with each other apart from CPU, RAM, and hard drives (Technically Optical drives aren't different, but an Inspiron's won't fit a Latitude due to the larger faceplate). And most home customers don't care about docking solutions. Business customers want docking because it's too cost prohibitive for them to provide users with a Desktop PC and a Laptop computer.