Proportionately the most time in a triathlon is spent cycling. Cycling is the easiest part of a triathlon to complete, but the hardest part to go fast.
Triathlon DVD will get you up to speed on the bike leg with the following:

• Handling, starting, stopping, cornering, and safe riding skills
• Setting your bike up so you will be comfortable, powerful, and fast
• Overview of all the equipment you will need for cycling, from the basics to the "bling"
• Workouts, drills, techniques, and strategies to practice on the bike
• Mental skills and sports psychology