There are coolers made by other companies.
Logisys CF206 http://www.logisyscomputer.com/views...06&DID=COOLDEV
Jetart JACSH1 http://www.jetart.com.tw/
Vantec Iceberq5 http://www.vantecusa.com/p_ccba5c.html
Zalman VF-700 (aluminum/copper, copper, with or without LED's) series. http://www.zalmanusa.com/
All of these have been used on 6600GT AGP cards. Search for reviews.
Zalman also makes a newer one, FS-V7, but I haven't seen any reviews on that one. http://www.zalmanusa.com/