On Sat, 27 Dec 2003, Jonathan Hutchins wrote:

> My dad sent me some ZIPped JPEG files recently - he got much better
> compression with WinZip than I did with Linux "zip".  So it got me
> wondering.  I used to worry about this kind of thing back in the BBS
> days, but haven't thought much about it since.

When using the gnu/zip utility, use the -9 option for maximum compression.  
The default compression level is -6, which improves speed.

I'd put that in my pipe and smoke it.