I had never seen pound before. I've used ssltunnel in the same way but now I've switched to SSL hardware. I found the software performance almost unusable and SSL hardware is very cheap now on ebay. I've picked up 4 Intel boxes for about $200 a piece. They claim something like 600 connections per second. In software I might be able to do 6.
I did run into some redirect problems but did not see anything with ns_write. Is the patch you have for pound or aolserver?