Status
apple.com/support/systemstatus
What are my email settings for iCloud Mac Mail?
www.apple.com/support/mail-settings-lookup/
www.isitdownrightnow.com/icloud.com.html
Comcast
speedtest.comcast.net
Test yours ...
downdetector.com/status/comcast-xfinity
downdetector.com/status/comcast-xfinity/map
Electricity Utilities
ComEd Outage Map (Chicagoland)
PSEG Outage Center Public Service Enterprise Group (New Jersey)
developers.facebook.com/status
downdetector.com/status/facebook
downdetector.com/status/facebook/map
GitHubStatus
status.github.com
Google Apps Status Dashboard
downdetector.com/status/google/map
Microsoft LIVE
status.live.com
Outage Analyzer
outageanalyzer.com
status.twitter.com
downdetector.com/status/twitter/map