[Snaps]

Reading up again, seems it's like this:

- VVT-I - variable cam gear timing (like adjustable cam gears, changes timing but not lift)
- V-TEC - variable cam lobes (two sets of lobes, changes between them to change lift + duration)
- VVTL-I - variable cam timing, with variable cam lobes like vtec (changes between two sets of lobes, while at the same time adjusts the cam gear timing for a fine tune)
- I-VTEC - same as vvtl-i (uses two sets of cam lobes to change lift and duration, with electronically controlled cam gear to fine tune)

Edit: To add a few more in here:
-VVT-Ie - variable cam gear timing , with electronic control (uses electric motor that spins at the speed of the camshaft, adjusts it's speed to adjust timing. This is instead of using an adjustable gear controlled by hydraulics)
-Valvematic - Edit: Found it, the difference is that valvematic continuosly adjusts lift, it doens't just switch from one cam to another.

At least that's what I can manage to pull from the information I've found.