Iridium is a now defunct* communications company that was planning on orbiting 77 communications satellites in low earth orbit, (77 is the number of electrons an atom of the element iridium has)
The idea was no part of earth, no matter how remote would be out of sight of an Iridium satellite, and the satellites could interconnect your signal to any other point on earth.
Because they are in LEO, there is none of the time lag associated with geosynchronous communications satellites.
The Iridium satellites have huge flat solar power panels that at predictable times and places will act like a mirror and produce a bright flash in the early evening or pre-dawn sky.
There is a web site that tells you when to look.
* Iridium is apparently alive as a company again.
I checked http://www.heavens-above.com with a point in New Hampshire and there weren't any Iridium flares on 3/23/2013.