Welcome to cdf.
I like this "cdcovers.cc" site (link below). They are owner-related to these same cdf forums, I believe.
Some members have experienced incorrect (or no page-loading at all) functionality problems with this site but I believe their problems were related to the complex, newish versions of scripting methods authored into the website's Java functionality. You may have to fool with your "Scripts-allowed" settings in your firewall, Anti-virus or spyware softwares to get some of their complex scripting to work correctly. I assume it's a Sun Java vs Windows Java incompatibility (or an ActiveX incompatibility) that I'm talking about here. Windows security options also include some settings for scripting compatibilities too. But, you may experience no problems at all with your present setup settings ... it's just that some members set up script protection levels so high that they rival the Emperor's Personal Guard(!) so maybe those few (including me!) encountered webpage display issues!
I trust the "cdcovers" site and never got a cookie planted or detected other intrusive stuff ... so I have found that if I disable my Norton firewall and AV for a moment, the page displays correctly. Then I re-enable both FW and AV quickly after that, the site displays correctly from then on (per session) even with all my protection software running. Just a little shortcut trick if you don't want to fool with your script protection settings.
Scroll down to the DVD covers area.
You could also try "backing up" on the URL address to the main (home) page of your www.covers.to site (or trying .com for a web extension) to see if they are really offline or just changed the URL for the page that you chose to save as a "Favorite" link. Or do a web search for "www.covers" to see if they have changed providers. Some providers get angry when they loose business and refuse to provide "redirection" links to a websites new host.