Flight Form and Swift Flight Form benefit from a paladin's Crusader Aura. Druids who have acquired a mount able to go 310% flight speed will now also go that speed while in this form.
When leaving flight form while moving horizontally you keep the speed in that direction (in addition to falling down of course). When dismounting from an epic flight mount one is slowed down. Care should be taken when doing a very fast caster -> epic flight -> caster shift as you pick up the speed instantly and can toss yourself into trouble easily.
If dismounted during the Netherwing revered races, a druid quick on the draw can reshift and get back into the race without losing, something normal mount users cannot do.
Even though the Swift Flight Form is unable to run along the ground, if you fly very close to the ground you will enter ground effect. Your speed will be reduced from 280% to 100% just like the flying mounts. When flying in ground effect you are considered to be on a ground mount, however you can loot, skin or collect herbs or do nearly anything that your character could do with his bare hands, all this without coming out of swift flight form. You can't mine because that involves use of a mining pick which your bird can't use.
As of patch 3.0.3, certain items intended to be usable from a flying mount do not work in flight form, unexpectedly causing you to shift out of form and plummet towards the ground. If you are fast enough and high enough, you can recover by switching back to flight form. This has been reported as a bug, and will hopefully be fixed in later patches.
0400Patch 4.1.0 (26-Apr-2011): The troll druid models for Flight Form and Swift Flight Form have been slimmed down to be more in scale with other druid flight forms, and have had their animations improved.
0400Patch 4.0.6 (8-Feb-2011): Mount Up: This guild perk now applies to Flight Form and Swift Flight Form as well.; Worgen and troll druids now have new art for Swift Flight Form.
0300Patch 3.2.0 (04-Aug-2009): The level requirement for this skill has been increased to level 71. Flight Form and Swift Flight Form now benefit from a paladin's Crusader Aura. Druids who have acquired a mount able to go 310% flight speed will now also go that speed while in this form.
0300Patch 3.0.3 (04-Nov-2008): Now available from the trainer at level 71 for 19 gold, requiring 300 riding skill from an artisan riding trainer, and Flight Form learned.
0200Patch 2.1.2 (2007-06-19): Druids in Swift Flight form can no longer loot herb nodes.
0200Patch 2.1.0 (22-May-2007): The Druid Epic Flight Form is now available through a series of quests