The harbor gatehouse granting access to Stormwind Harbor was built by human, dwarven, and gnomish construction workers all under the supervision of Foreman Wick.
Stormwind Harbor itself is one of the major ports for transport to both Northrend and Kalimdor, thereby connecting to Valiance Keep in the Borean Tundra and replacing the Menethil Harbor ↔ Auberdine line connecting the Eastern Kingdoms to Northern Kalimdor; the line to Auberdine has been replaced in the Cataclysm with a route from Rut'theran Village directly connected to Stormwind City, allowing night elf and draenei players to avoid the "death run" through the Wetlands.
It is worth noting that Stormwind Harbor features a new type of boat, an Icebreaker that is propelled by a steam powered paddlewheel. The Kraken, which runs to Valiance Keep in Northrend, is an example of this newly developed ship.
A short distance from mainland, just off the coast and north of the shipyard, the harbor lighthouse is located. Built on a small island, this lighthouse can clearly be seen from far away. The enormous size distinguishes it from the average lighthouse, indicating it might also function as a guard tower.
It is relatively featureless apart from the building and a boat, a crate, a dock, and a grave on the eastern side.
Stormwind City is the only capital city containing a harbor within the city boundaries; sea access to Darnassus is through Rut'theran Village, which is not located within the city itself. Stormwind is also the only capital city with an open waterfront within its city boundaries.
Steven Allen is stationed behind the boats, and is taking a day off after his big work on the Stormwind Harbor, because he technically made it. Steven Allen is a Senior 3D Artist at Blizzard who designed the Harbor.