I've added some of my favorite links for Slovakia in the right margin.
This website provides info on the city I lived in for five months last year. I especially love the photo section. It brings back wonderful memories of the strolls I used to take in the cool autumn evenings with the ancient architecture looming in the background.
A website that has a little of everything pertaining to Slovakia but I especially like the language section. Check it out if you want to see the subtle differences between Czech and Slovak.
This is a subscription site but they do have some free articles.
Once again, a little of everything with a great discussion forum on all things Slovak!