Probably the best source of information is the SparcLinux WWW site.
The URL for it is: http://www.geog.ubc.ca/sparclinux.html.
The main FTP site is ftp://vger.rutgers.edu/pub/linux/Sparc
which is mirrored at ftp://ftp.cps.cmich.edu and at
ftp://swell.hampshire.edu/pub/linux/Sparc. It will also be
mirrored at ftp.redhat.com soon.
Also, if you plan to use or help develop SparcLinux, you should
subscribe to the mailing list. To subscribe, send mail to
majordomo@vger.rutgers.edu with ``subscribe sparclinux''
in the body and the subject line empty.