The patents at issue were related to wireless (802.11) and video technologies (H.264) that are part of industry standards. When standards are developed the contributing companies agree to license their patents on "fair reasonable and non-discriminatory" (FRAND) terms. Microsoft and Motorola have been fighting over what that term means.
Motorola initially asked for 2.25% of revenues for products incorporating the standards. In a court decision a few months ago the appropriate rate was set at 0.5-3.5 cents. This litigation is important for tech companies because it has generated a framework for evaluating what a reasonable royalty is for standard-essential patents.
You can read one of the recent decisions in this case on Google Scholar.