Hey, I've seen that you have updated the bzip2 library that is included in the Shareaza library. As I didn't know what bzip actually was, I searched... and found.
However, the Wikipedia article names a second implementation of bzip2 called pbzip2, which makes use of multi-threading while bzip2 does not. This means that depending on where we do use bzip2 (which I don't know), users of multi-core CPUs might (highly?) profit from using pbzip2 instead of bzip2.
pbzip2 library: http://compression.ca/pbzip2/
mfg,
Old
PS.: You're doing a fine job, Ryo