Zalman just went bankrupt after people figured out they stole $3 billion dollars from banks. It's too bad since they really did make some good products. All their patents should go up for sale so I suppose the tech will continue. http://www.maximumpc.com/zalman_reportedly_files_bankruptcy_allegations_bank_fraud_arise_2014
Yeah their copper heatsinks are nice. I've used a lot of them over the years. Though in recent years I think Noctua is making nicer stuff if you're looking for high-end coolers.
I had a copper Zalman on my old AMD Athlon X2 with a case mounted fan sitting over the top. Thing did the job well, hopefully someone buys up all of their IPs.