Tutorials & Courses
Interactive Irish Lessons - Offers serious lessons as well as basic travel lessons.
Learn Irish Gaelic - Over 100 Irish lessons.
Irish Lessons - Over 100 Irish lessons. Free registration is required.
One Minute Irish - Short Irish audio lessons covering basic subjects.
Interesting Reading Practice
Beo! - Online news.
Foinse - A weekly online newspaper.
Lá Nua - Online news.
Project Gutenberg - Several online books freely available.
Wikipedia - Wikipedia in Irish. If online news isn't interesting enough for you, you can search for whatever you like on Wikipedia.
Things To Listen To
Global Recordings Network - Provides a few free Christian audio recordings. A great resource.
Raidió na Gaeltachta - Irish radio.
Raidió Fáilte - Irish radio from Belfast.
Other Irish Resources
Digital Dialects - This website offers basic vocabulary and games to help you practice.
English-Irish Dictionary - A useful online dictionary.
Linguanaut - A useful collection of basic phrases.
Verbix - The best online verb conjugator I have found. Just type in a verb and Verbix will completely conjugate it for you.