If you're looking for Irish Dictionaries such as those mentioned above, they're now available on-line at www.teanglann.ie where you can listen to vocabulary in the three main dialects - there's also a link to Focloir.ie which also has pronunciation provided. Dineen's is now on-line and there's the Cork Irish Wordpress website. I would also like to mention the Irish Language Forum (formerly The Irish Learner's Forum) which has sections on Munster Irish, Scots Gaelic, and Learning resources srl.