Loki has his own clothing line, full of "low key" outdoor gear. The tagline is "Shape Changing Gear" (source).
Norse mythology attributed earthquakes to Loki, explaining them as the violent thrashings of the god as he endured a punishment of being bathed in snake venom deep below the earth. You can read about it in Snorri Sturluson's Prose Edda.
In the early 20th century, Danish people used the phrase "Loki is sowing his oats," or "Loki is driving his goats today" to explain the phenomenon of steam rising up from the ground when the sun warmed it (source: Olrik, Axel (1909), translated by Eli, Anker. "Loki in Younger Tradition" as published in Særtryk af Danske Studier).
Referring to the Loki character in the popular Marvel Comics series Thor, videogame and multimedia website IGN named Loki the #8 greatest comic book villain of all time. Based on Loki's prominence and popularity, they surmise that he is "a character that writers must simply love to write" (source). We agree.
Actor Tom Hiddleston, who plays Loki in the May 2011 feature film Thor, based on the Marvel comic book series of the same name, calls his character "a comic book version of Edmund in King Lear, but nastier" (source).
Loki is the name of an Internet product that allows you to "automatically incorporate [your computer's] exact physical location into your Internet experience." The product is named, in part, for the trickster god. The folks at Loki say, "Location plus trickery. Yeah, there's some symbolism there." Find out what they have to say about the Norse god here.