Useful stuff.

FaceBook feeds:

From Quarks to Quasars

Sky and Telescope magazine

Science is Awesome

Useful Apps for smartphones or tablets:

Google Earth

Moon globe

Exoplanet

NASA

APOD

SkyWalk

Planets

SkyWeek

Distant Suns

Moon

Night Sky

Sky Map

Misc resources:

Astronomy magazine

Sky and Telescope magazine

In/around DC:

Smithsonian Air and Space Museum

Smithsonian Udvar-Hazy Air and Space Museum annex

Good sites (a very, very brief start):

http://www.heavens-above.com/

http://www.fromquarkstoquasars.com/

http://skymaps.com/

http://astronomy.com/

http://www.skyandtelescope.com/

sunrisesunset.com

http://www.galaxyzoo.org/

http://www.wechoosethemoon.org/

http://www.stargazing.net/naa/sotw.htm