SAquatic Form
hapeshift into aquatic form, increasing swim speed by 50% and allowing the druid to breathe underwater. Also protects the caster from Polymorph effects.
You can use Aquatic Form for all kinds of things, but it is mostly a novelty. There aren’t enough underwater quests or battlegrounds to make this any kind of real advantage.
Travel Form
Transforms the druid into a travel form, increasing movement speed by 40%. Also protects the caster from Polymorph effects. Only useable outdoors.
Travel Form is simply great. You can get away from most attackers, or simply cover more ground in quicker time without having to mount up. Travel Form is a handy tool in PVP, you can get away from an attacker, turn into kitty form, prowl, and return to hunt your enemy down while they can’t see you. You can also carry a WSG or EOTS flag in Travel Form, making the Druid the single best flag carrier in the game.
Travel Form is terribly fragile. You can be easily killed, so use it wisely.
Flight
13% of Base Mana
Instant cast
Transforms the Druid into a flight form, increasing movement speed by 60% and allowing you to fly. Cannot use in combat. Can only use this form in Outland.
While other players are shelling out 1,000 gold for their first flying skill and mount, you basically get it just a training fee (9 gold) by picking it up at the druid trainer. Like Travel Form, you can instantly transform into Flight Form and make a quick escape.
Swift Flight
Transforms the Druid into a flight form, increasing movement speed by 280% and allowing you to fly. Cannot use in combat. Can only use this form in Outland.

Swift Flight form is only available after paying the 5,000 gold for the skill and completing a long quest line. Still it is the ultimate druid form.
The act of shapeshifting frees the caster of Polymorph and Movement Impairing effects.
Tree Of Life
Transforms the Druid into the Tree of Life Form. While in this form you increase healing received by 25% of your total Spirit for all party members within 45 yards, your movement speed is reduced by 20%, and you can only cast Swiftmend, Innervate, Nature's Swiftness, Barkskin, and healing over time spells, but the mana cost of these spells is reduced by 20%.