Music:

 http://raisingchildren.net.au/baby_karaoke/baby_karaoke_landing.html

Songs and stories:

http://learnenglishkids.britishcouncil.org/en/

Games and quizzes for all subject areas:

http://www.woodlands-junior.kent.sch.uk/

Maths Games for all ages:

http://www.learn4good.com/kids/index.htm

http://coolmath4kids.com/

http://ie.ixl.com/

http://mathisfun.com/

http://mathplayground.com/

http://multiplication.com/

http://www.cjfallon.ie/DM-Intro.aspx

English: 

Phonics and Reading Activities: http://www.starfall.com/

www.teachyourmonstertoread.com

http://www.spellingcity.com/

http://resources.woodlands-junior.kent.sch.uk/literacy/index.htm

For all subject areas:

http://www.bbc.co.uk/schools/

Other

Hugh Lane Art Gallery: http://www.hughlane.ie/

Irish Museum of Modern Art: www.imma.ie

National Gallery of Ireland: http://www.nationalgallery.ie/

Keyboard skills (typing): http://www.auntlee.com/kids/easy_typing.html

Fun with animation: http://www.kerpoof.com

Make your own music: http://inudge.net/

Lots of word games for all ages: http://www.schooltimegames.com/language_arts.html

Fun with Lego: http://www.schooltimegames.com/language_arts.html

English Picture Dictionary: http://www.pdictionary.com/