Video, music, photos and social content can be embedded in your content using the Media icon (1st icon in the last row).
You only have to provide the url to the site (It works also when the url is shortened) you want to embed.
The following media sources are supported. (Additional capabilities for developers are also noted)
Video
Youtube - oembed - YQL
Blip - oEmbed
Hulu - oEmbed
Vimeo - oEmbed
National film board of Canada - oEmbed
Qik - oEmbed
Dotsub - oEmbed
Clikthrough - oEmbed
Kino Map - oEmbed
Funny Or Die - Embedded
College Humour - Embedded
Metacafe - Embedded
embedr - Embedded
5min - oEmbed is XML only - using YQL to translate it
ustream.tv - oEmbed is not JSONP enabled - using YQL to translate it
viddler - OGP
twitvid - Embedded
bambuser - Embedded
xtranormal - Embedded
Gametrailers - Embedded
Vzarr - Embedded
VHX - oembed
bambuser - oembed
dailymotion.com - oembed
animoto - oembed
justin.tv - YQL JSON
livestream - OGP
scivee - embedded
veoh - embedded
minoto-video - oembed using YQL
TrailerAddict - OGP
vodpod - oembed YQL - broken as the oembed has absolute positioning which breaks the display
fora.tv -OGP YQL
TED - OGP YQL
Aniboom - embedded
Comedy Central - OGP
snotr - embedded
zapiks - OGP
youku - embedded
wistia - Oembed
Audio
Soundcloud - oEmbed
HuffDuffer - oEmbed
BandCamp - YQL and Embedded
podomatic - OGP
rdio.com - oEmbed
hark.com - OGP
chirb.it - YQL and oembed
official.fm - YQL and oembed
mixcloud - YQL and oembed
shoudio - oembed
audioboo.fm - OGP
Spotify - OGP YQL
Photo
flickr - oEmbed
photobucket - oEmbed
instagram - oEmbed
yfrog - oEmbed
23HQ - oEmbed
Smugmug - oEmbed
twitpic - OGP YQL
500px.com - OGP
visual.ly - YQL Lookup
img.ly - Thumbnail view
imgur.com - Thumbnail view
twitgoo.com - Thumbnail view
gravatar - Thumbnail view when using mailto
pintrest - YQL - Embedded view of a sort.
circuitlab - image view
skitch - YQL oembed
graphic.ly - OGP
dribble - jsonp lookup
Lockerz - YQL lookup
AsciiArtFarts - YQL Lookup
lego cusoo - OGP over YQL
plannary - OGP over YQL
propic - OGP
avairy.com - OGP
lomography - ogp
weheartit - ogp
glogster - ogp
chart.ly - embedded
twitrpix - OGP
chictopia - OGP
Rich
Meetup - oEmbed
gigapans - Embedded
Slideshare - oEmbed
ebay - Embedded
scribd - Embedded
screenr - Embedded
tumblr- JSONP lookup
imdb - JSONP lookup via imdbapi.com
wikipedia- JSONP lookup
github- JSONP lookup (CSS)
eventful - OGP
myspace - OGP
live Journal - JSONP Lookup (CSS)
wordpress - oEmbed (wordpress.com, wp.me, blogs.cnn.com, techcrunch.com). I can add other wordpress sites as well.
circuitbee -Embedded
stack overflow - JSONP Lookup (CSS)
Facebook - JSONP Lookup (CSS)
Pastebin - Embedded
Pastie - YQL lookup
kickstarter - Embedded
issuu - OGP
reelapp.com - Embedded
Etsy - OGP over YQL
Amazon - Embedded - Requires Affiliate code
linkedin - Embedded IFRAME - found a link that works :)
Lanyrd - YQL (CSS)
twitter - Oembed - status only - but that is ok I think
github gist - oembed
speakerdeck - yql oembed
dipity - yql oembed
dailymile - oembed
deviantart - oembed
Roomshare Japan - oembed
mobypictures - oembed
prezi - embedded
popplet - embedded
authorstream - OGP
googlecalendar - Iframe
cacoo - oembed
pearltrees - embedded
urtak - oembed - is broken in iframe return atm -seems to be an embed.ly issue??
jotform - embedded
Urban Dictionary - YQL lookup
Ars Technica - YQL Lookup
Eventbrite - OGP YQL
last.fm OGP YQL
Rotten Tomatoes - OGP YQL
iFixit - OGP
qwiki - OGP
brighttalk - Meta info
tinychat - OGP
tourwrist - embedded
bnter - OGP
bigthink - OGP
wirewax - OGP
whosay - OGP
timetoast - embedded
tripline - OGP
jsfiddle - embedded