Are 26" racing wheels still being produced? It seems like all new road and triathlon bicycles are being made with 28" wheels and I've found it almost impossible to get 26" wheels for and older tri bike. Are they still being manufactured?
Quick answer is yes. 

http://www.zipp.com/wheels/404-650c-tubular

http://www.corima.com/boutique/default.cfm?basketAction=add&amp;reference=161102
 - if that link doesn't work it is for 650c Corima Wheels.