I have posted some performance numbers based on some tests that I have run on NIO, IO and Converted IO. You can see the results here:
http://www.realityinteractive.com/rgrzywinski/archives/000097.html
There are a whole bunch of links to other things such as my NIO and SSL grievings.
I rarely check back to this forum so either contact me directly or post a comment on my blog if you have questions.
(FYI: “Converted IO” is explained in some of the links)