Sprint and [Darkflight], one of the worgen's racial abilities, can be used immediately after each other, making worgen rogues especially tough to catch. Their sprint can outpace mounts below level 40 for a short time, and their Darkflight can outrun most enemies on foot. Darkflight has a three minute cooldown so this combo can only be used so often.
For PvP, you may wish to save sprint mostly for chasing down your fleeing enemies, especially once you get [Blind] and [Vanish].
In PvE, sprint provides a very useful "get out of jail free" card.
The Sprint functionality is identical to the effects of the [Swiftness Potion] created with the Alchemy skill, except the potion will break stealth.
Use Sprint to quickly close the distance on enemies that are trying to snare you or otherwise keep their distance. Especially useful against hunters and mages who've just blinked away.
Use Sprint to beat everyone else to that mining node, herb, or treasure chest.
If you're sure you won't be fighting much on the trip, Sprint can be used before level 20 to help cover long distances.
If you're making a Bank Alt and don't mind leveling it to 10, then picking a rogue can save you a lot of time running from the Auction House to the mailbox because of Sprint.
Sprint can be combined with the [Insignia of the Alliance] and [Vanish] to allow very quick getaway from battles. Combining Sprint and Vanish in a Macro may make this even more convenient. One may also find useful to add [Cloak of Shadows] to this combination to avoid having damaging spells canceling their stealth.