Irish Citizens over 18, and have held an Irish Passport can now apply online. Processing takes around 10 working days.
Also, if you lose your passport, if it's stolen or damaged, you can use Passport Online to report it lost and apply for a renewal.
To apply click here - Passport online
Irish Passport Application forms are available at the Irish World Heritage Centre for other applicants (ie. Under 18s, first time applicants, change in name).
For more information visit the DFA website