Costco and Ikea have pretty big drying racks. I don't know if costco always has them in store, but my mom's is from there and very nice. I air dry a LOT of our clothing.
Sweaters I dry flat on a towel on a drying rack. I handwash a lot of mine (merino, cashmere) with euclan, roll up in a towel to blot water out, and then air dry on a dry towel. I do 5-6 sweaters at a time (similar colors) in the wash tub or bathtub, so doing it periodically isn't that bad IMO. I use a clothesline some too, but use my drying rack as it is more convenient for me.
Mama to DS-2004
DD-2006
and a new addition-ds born march 2010