New Guild Wars Arena Build Profile
Samyel on the TTH Guild Wars site looks at a ranger that does a little bit of everything. Poison, crippling, interrupts, traps and energy management. The only thing this versatile build doesn't do is heavy damage, but really, with such a big bag of tricks, damage is something you can leave to your team mates. Read the details here.
When you engage the enemy, cast Apply Poison and start liberally dishing out arrows. Switch targets depending on who is being the biggest nuisance: Crippling Shot goes on warriors, while Distracting Shot and Savage Shot are excellent for harassing casters. If the fight focuses on one area (say, a Flag Stand or on a flight of stairs) take the time to plant traps under your enemys feet.