Here's a step by step look at my method on this Dredd strip.
I first scan the pencil page with my trusty A3 scanner (not an A2 as I had said!) then in photoshop I magically turn the pencil into ink with the use of the image-adjustments-levels buttons. This takes a while to get right but not as long as actually inking, and you can't spill a bottle of ink over the page like I've often nearly done! I then turn this layer to a multiply (under layers) and start colouring on layers placed under the line layer. Simple!
I do feel a twinge of guilt about using this method after spending so many years learning how to ink and finding the tools to do it right, but times change and this way is so much faster, something that really suits me in my life right now since our little one was born. You can blame my daughter!