Post them here! Along with a brief description of what the link is, if you can. When I have the ability I’ll make this a sticky thread.
Scots Gaelic - http://www.bbc.co.uk/alba/foghlam/learngaelic/
Irish - http://www.bbc.co.uk/northernireland/irish/blas/learners/
English - http://www.bbc.co.uk/worldservice/learningenglish/ 
Irish Gaelic Translator.com translation forum: http://www.irishgaelictranslator.com/translation/
IGTF self-teaching language product reviews: http://www.learnirishgaelic.com/productcomparison/
IGTF dictionary reviews: http://www.learnirishgaelic.com/productcomparison/dictionaries/
IGTF’s “frequent translation requests” FAQ: http://www.irishgaelictranslator.com/articles/category/frequent-translations/
Creative ideas for learners: http://www.irishgaelictranslator.com/translation/viewtopic.15856.html
http://www.nualeargais.ie/: Free learning software, as well as lots of tips for learners, and even suggestions as to how to play games, such as “fíche ceist.”
Information on Irish forenames, as well as name suggestions for pets, boats, houses, etc.: www.namenerds.com/irish
Information on Irish surnames: http://www.irishidentity.com/names.htm (they have first names as well, but namenerds does a better job with those, I think)
Technical terms in Irish (note for those who don’t read Irish: if you’re looking for the Irish word for a technical term in English, you’ll want to choose the “Béarla-Gaeilge” list) http://www.acmhainn.ie/nuathearmai.htm
Hearing pronunciation/voice synthesizer. Plug in an Irish word or phrase, and hear it pronounced by a native speaker of the Gaoth Dobhair (Ulster) dialect. Note: This works better with single words than with paragraphs. We’re told that other dialects will eventually be added: http://www.abair.tcd.ie/?page=synthesis&lang=eng
Redwolf
http://www.irishpage.com/irishpeople/
For rank beginners such as myself, this is a friendly page, easy to interpret, and easy to understand.
http://ga.wikipedia.org/wiki/Príomhleathanach - Wikipedia in Irish! (I need one in “Simple Irish”, I think..)
http://www.teg.ie/english/sample_papers.htm - Sample exam papers for a variety of Irish examination levels, including complete beginners. Just found these today, wish they posted the answers!
http://fsii.gaeilge.org/audiofiles/ - Audio files to supplement the book “First Steps in Irish”
http://www.omniglot.com/writing/irish.htm - a fairly technical summary of Irish, but has some useful links at the bottom
Open Office has Native Language Projects in
Gaelic - Scottish (gd) and Irish(ga)
I have no Idea how complete they are.
Firefox has an Irish language version too. Since there’s no “Yes” in Irish, just the positive form of the verb being used, whenever I get an error message I have to try to remember whether the positive responses are generally on the right or the left.
Fun link - Irish text-to-speech synthesiser!
Don’t take the pronunciation as gospel…remember how odd English synths can sound…but it’s quite fun to play with and I find it an incentive for making sentences..
I linked to that one above as well.
It does OK with individual words, for the most part (it doesn’t do quite so well with phrases and sentences). It is strictly Gaoth Dobhair dialect, though (though they say they plan to do other dialects eventually)
Redwolf
ni feicim ar an liosta seo:
http://talkirish.com/
The Poetry Ireland website:
www.focal.ie.
"Is é seo an Bunachar Náisiúnta Téarmaíochta don Ghaeilge, (arna fhorbairt ag Fiontar, DCU i gcomhar leis an gCoiste Téarmaíochta, Foras na Gaeilge).
This is the National Terminology Database for Irish, developed by Fiontar, DCU in collaboration with An Coiste Téarmaíochta, Foras na Gaeilge."
Tá aip gutháin “get the focal” le fail (phone app linked to the above online dictionary and database).
http://www.litriocht.com/shop/ Siopa deas ina bhfuil leabhair Ghaeilge,leabhair as cló agus r-leabhair (ebooks)
[Thread revival. - Mod]
Great thread to know about some useful resources for the Irish language learners.