The following are some of the important press release distribution sites, where press or news releases can be submitted free of charge. If you want maximum exposure to your release, it is recommended to go for paid ones or contribute to upgrade your release.
PRWeb - http://www.prweb.com/
PR Urgent - http://www.prurgent.com/
PRLeap - http://www.prleap.com/ -
PR Newswire - http://www.prnewswire.com/
PRWeb Direct - http://www.prwebdirect.com/ -
PR Free - http://www.prfree.com/
TheOpenPress - http://www.theopenpress.com/
Free Press Release - http://www.free-press-release.com/
Pressbox.co.uk - http://www.pressbox.co.uk/
I-Newswire - http://www.i-newswire.com/
OpenPress - http://www.openpress.com/
Press Release Network - http://www.pressreleasenetwork.com/
Soft Press Release - http://www.softpressrelease.com/
Market Wire - http://www.marketwire.com/
URL Wire - http://www.urlwire.com/
Web Wire - http://www.webwire.com/
EMediaWire - http://www.emediawire.com/
BusinessWire - http://www.businesswire.com/
Canada Newswire - http://www.newswire.ca/
PR Log - http://www.prlog.org/
PR Inside - http://www.pr-inside.com/
PR 9 - http://www.pr9.net/
1888PressRelease.com
ClickPress.com
EcommWire.com
Express-Press-Release.com
Free-Press-Release.com
Free-Press-Release-Center.info
I-Newswire.com
NewswireToday.com
PR.com
PR9.net
PR-Inside.com
PRBuzz.com
PRCompass.com
PRUrgent.com
Press-Base.com