Back in January I got hooked on Trailhead, the new and fun resource for learning about Salesforce technology on the Salesforce Developer Community site.
Trailhead offers numerous lessons, each of which can be tackled in 10 to 25 minutes. At the end of each lesson is a challenge which either involves either answering some questions or logging into a free developer org and doing some work. Trailhead verifies if your answers or work are correct, and if they are, gives you points for completing a challenge. If you complete a set of challenges, you can earn a badge which is displayed on your Salesforce Developer Community profile.
Because Trailhead tracks your progress and offers lessons that can be finished in as short as 10 minutes, it makes it easy to chip away at training even if you don't have time to sit down for a long length of contiguous time. You can just log in whenever you have a spare 10 to 25 minutes and knock out a lesson.
Even though you can always work on Trailhead anytime and anywhere that you have access to a browser and an Internet connection, I highly recommend attending a Trailhead LIVE event for a fun change of pace. This was the second Trailhead LIVE event, and more should be coming soon, so keep a lookout on Twitter and other channels for announcements of future Trailhead LIVE events.