Why different types of charges??

So I have had several different camera bodies and was wondering why the different types of chargers? I really like the more compact styles that require no cords. The whole unit plugs into the outlet. It is more compact, requires less space in the bag, and no cords to mess with. I just picked up a T3i and it requires a seperate cord and the battery charger. Why not just 1 style??

I guess you mean the difference between the "Canon LC-E8E" and the "Canon LC-E8". I'd imagine the main reason for the E version is that you can just ship it with different end cables for different plug types. Maybe most T3i's ship with the LC-E8E from the states as they do international shipping?

My XSi and 7D both came with flip plugs but I bought them in Canada so we may only get North America type chargers?

Yes, it's for plug compatibility. The folding plugs only work with the "Edison" blades for 110V systems. Personally, I prefer a charger with a separate cord; it means I don't need an oversized power strip when I'm charging multiple devices on the road. So "more compact" is all relative. Just try plugging in your LC-E8 and an AA charger (for your flash) and the wall wart for your cell phone and your computer all at once.

Why do people keep chargers in their bags? Mine lives on a shelf, plugged in, I throw the batteries on it when I get home and it never moves, unless im going on a trip of course.