The main Samba site is samba.anu.edu.au in pub/samba/. Contact
samba-bugs@samba.anu.edu.au for help with this site.

Mirror sites include:

ftp://nimbus.anu.edu.au/pub/tridge/samba
ftp://sunsite.auc.dk/pub/unix/networking/samba/
ftp://src.doc.ic.ac.uk/packages/samba/
ftp://choc.satech.net.au/pub/samba/
ftp://ftp.warwick.ac.uk/pub/linux/sunsite.unc-mirror/system/Network/samba/
ftp://sunsite.unc.edu/pub/Linux/system/Network/samba/
ftp://ftp.uni-trier.de/pub/unix/network/samba/
ftp://ftp.spectrum.titan.com/pub/samba/
ftp://ftp.demon.co.uk/pub/unix/unix/samba/
ftp://sunsite.mff.cuni.cz/Net/Protocols/Samba/
ftp://ring.aist.go.jp/archives/net/samba/
ftp://ring.asahi-net.or.jp/archives/net/samba/
ftp://ftp.cs.ucr.edu/pub/software/samba
ftp://ftp.ua.pt/pub/misc/samba/

There are several others. Give archie a try.

SCO binaries available from:
ftp://ftp.markv.com/pub/samba (built by lance@fox.com)

AIX and DEC OSF/1 binaries are available from:
ftp://151.99.220.5/pub/samba (built by davide.migliavacca@inferentia.inet.it)

QNX binaries and source code:
ftp://quics.qnx.com/usr/free/staging/samba

Http sites include:

http://samba.canberra.edu.au/pub/samba
http://www.choc.satech.net.au/pub/samba/