Just two accessories for me:
1. Monaco Vertical Pouch Type Leather Case - Black - (from WirelessGround.com:
Samsung Galaxy Note 2 II Monaco Vertical Pouch Type Leather Case with Belt Clip - Black)
Really like it; it's high quality leather with solid stitching. The phone is very snug in the pouch, so no worries about it falling out. I usually put it inside my left front pocket and clipped to the top of the pocket or sometimes clip it on the outside of the pocket sitting vertically on my hip. Something I've really grown fond of with it is putting the phone on top of the pouch where it sticks to the leather quite well making it easy to hold with one hand vertically or horizontally or even sitting flat on a desk or table. Otherwise the phone itself tends to be slippery in hand or slides too easily on a flat surface. It's a win-win for me as I don't like cases (how they change the look and feel of the phone), yet it protects the phone in transport.
2. Samsung Spare Battery Charging System (3100mAh battery included) - (from Samsung:
Galaxy Note) - Note: if you sign up for a Samsung account, it's 50% off.
Note 2 has excellent battery life, but I still love having a fully charged spare battery ready to go at a moments notice. No need to ever worry about tethering to a charge, instead just swap and go! It's also easily portable and makes a good stand (portrait or landscape).