I don't get involved with much new construction, but when I do (or with a major refurb) I always ask about telephone wiring. The most common response I get is "Oh, we never thought about that - Yes, you'd better make provision." Then they suddenly realize that they want a telephone in the kitchen, the main bedroom, etc.
CATV -- As it's never likely to reach this part of the country, no, but I'll always inquire about outlets for a regular UHF rooftop antenna, whether they want backfeeds to get satellite/DVD/VCR signals etc. into other rooms, and so on.
