Belle.
It depends what you're looking for. I originally subscribed to Chritchurch as I thought it might be a useful resource of scripts for old dances still used for competitions and medallists. But, in general, it wasn't, and turned out to be more a library of popular social dances. But the quality is good, and it is a cheap way of getting scripts for the new prizewinning dances, which is is now my main reason for subscribing.
I recently found some more sequence script libraries (see links below), which again are not really what I am looking for but will have their uses. The first contains many older and more obscure dances, though many of the dances there seem more innovative and suitable for advanced dancers.
http://sequenceblogger.wordpress.com/
Another one I found has a small selection of popular dances.
http://sequencedancing.co.uk/