Innovative clothesline that is elegantly simple with hanging wood weight to keep lines taut. Apartment Therapy post which links to the architect's site (designed in Australia, where outdoor line drying is very popular).
Pulley clothesline with shelves for basket and kids to stand to help.
Very detailed outdoor clothesline tutorial. Blogger includes time estimates, measurements, and a great deal of practical advice to build a stout clothesline!
"How to Grow Your Own Clothesline" - good description of the process. Few dimensions.