I've checked mine, and they are ok, and they aren't duplicated, I think. (And the spelling is correct now.)

But is there an easy way of checking whether a site you want to put a link to is or isn't already up there already?

The other query is how to deal with links that could logically fit in two headings - for example if we came across a site about Gaelic folk, (both Irish and Scottish?) or about French Canadian songs (American and International?) I'd think the right way would be to have some kind of cross-reference, with a single full entry.