Kanban vs Scrum

I recently came across a great free book written by Henrik Kniberg and Mattias Skarin called, "Kanban and Scrum - making the most of both". It includes the most concise description of each development process that I've seen.

For Scrum, your overall concern is with timeboxing everything, making sure that there are short cycles and short meetings that are strictly adhered to. With Kanban, your main concern is with limiting the amount of work in progress. By limiting how many items are in each phase of development, your aim is to establish an on-going flow. It seems to me that Scrum is better geared for new product development and Kanban is better for existing products that need maintenance and new features. There is obviously much more to each and I recommend you read their book.