No, we haven't been to New Mexico recently. These photos were uploaded to Flickr today but taken in December 1998! The caverns are quite spectacular and this is mainly based on their size. Surprisingly, better dripstone formations are to be found in the Sonora Caves in Central Texas which is "alive" and very humid. Unfortunately I lost my digital images from Sonora so these scanned images are the best I have.
Available light scores over flash in caves as the limestone shows as a dull grey with flash whereas the colored lighting in Carlsbad produces wonderful effects. Carrying a tripod is well worth the extra effort.