That's the "8 o'clock arc", a strong gravitational lens produced by a LRG (luminous red galaxy); the object being lensed is a LBG, a Lyman Break Galaxy. LBGs are extreme starburst galaxies, but are a very long way away, so studying them is extremely difficult. When one is lensed by a foreground galaxy (or cluster), we get a chance to study one closely.
Another way to study LBGs is to find analogs in the local universe; the zooites' discovery of green peas helped a lot in that regard, because green peas do resemble local analogs of LBGs.
Read more in Rick Nowell's Galaxy Zoo Object of the Day, stardate 25th September, 2010.
Has the 8 o'clock arc been APODed? I don't think so.