The zip file is now in the same place as the .sit one.
Why waste space and risk errors by using multiple archival formats?
Unless we're really low on disk space on this server (in which case I'd rather remove some of the older stuff) I like a bit of redundancy here. Also, it gives people their pick - in fact I'd argue that we should probably have a gzipped tar-ball as well ;-)
Cheers, - Andreas