Church records from Austria and Germany are beginning to be digitized and are now being made available online through an experimental single portal. So far it includes both some Catholic and Evangelical Churches. The Austrian part in particular contains some Slovak families.
The project is funded by the Catholic dioceses of Austria and the European Union. To visit the site and see the matrica listed by village just click on the site listed below. You can also click on the British flag in the upper right corner to see basic information explained in English. You need to agree to their terms (just the usual stuff) to proceed to see the material.