2NE1 is part of the YG Entertainment family and debuted last year. They were initially being called the female version of Big Bang, and made several appearances with them to spike their popularity. The group name has several meanings, obviously "21" or "ToAnyone" and their name was said to be the name of a group that "will produce music that is fresh like the age of 21. And like the number '21' in a game of Blackjack, it’s meant to never lose." It has also been said to stand for "New Evolution of the 21'st Century".
The group's four members are CL (Lee Chae Rin, 이채린), Bom (Park Bom, 박봄), Dara (Sandara Park, 박산다라), and Minzy (Gong Min Ji, 공민지). They released the song "Try to Follow Me" (날 따라 해봐요) earlier this year and the video was one of my favorites thus far of 2010.
Their official website
Additionally, to highlight all the individual talents of each of the four members, at the end of last year all four members released solo songs and then promoted them as a group.
CL and Minzy released a duet titled "Please Don't Go" and just did some awesome live performances. No music video was produced. If this link goes dead, someone should tell me so I can find another performance.
Park Bom released a slower tempo song titled "You and I". It has a fun (maybe sad) story.
Finally, Dara released a single titled "Kiss". I like this the least because she obviously partnered with Cass Beer to promote this song and the beer is disgusting. The product placement in this video is so horrendous that I at first thought this was some kind of joke of a long commercial and not actually a music video.