Ancestry is offering free access to its Irish collection until Sunday 19th March.
You can use either Ancestry.com (USA) or Ancestry.co.uk (UK and Ireland). Other versions of the site may be offering the same opportunity to explore the Irish records in the database; I don't know for sure because Ancestry's (**!&*?!**) geo locator stops my computer viewing the home pages.
If you don't already have an account, you can register for a free one by providing your email and password. A user name is sent to you, and you can then search the records. It's a quick, automated process and you don't have to provide any financial details.
Access to the records in the featured collection will end at 11:59pm ET or GMT, depending on which site you're using.