The latest verion of sudo is 1.6.8p8
The "authoratative" sudo ftp site is ftp://ftp.sudo.ws/pub/sudo/
and there is a web page at http://www.sudo.ws/sudo/

File:			Description:
=====================	===========================================
sudo.tar.gz		Link to the current version of sudo
sudo-1.6.8p8.tar.gz	Sudo version 1.6.8p8
sudo-1.6.8p2.patch.gz	Patch to update sudo 1.6.8p1 to 1.6.8p2
sudo-1.6.8p3.patch.gz	Patch to update sudo 1.6.8p2 to 1.6.8p3
sudo-1.6.8p4.patch.gz	Patch to update sudo 1.6.8p3 to 1.6.8p4
sudo-1.6.8p5.patch.gz	Patch to update sudo 1.6.8p4 to 1.6.8p5
sudo-1.6.8p6.patch.gz	Patch to update sudo 1.6.8p5 to 1.6.8p6
sudo-1.6.8p7.patch.gz	Patch to update sudo 1.6.8p6 to 1.6.8p7
sudo-1.6.8p8.patch.gz	Patch to update sudo 1.6.8p7 to 1.6.8p8

Note that these archives are compressed with gzip, if you don't
have a copy of gzip, download and build gzip-1.2.4a.shar from the
"misc" subdirectory.  To unpack an archive, run:
    gzip -dc sudo-1.6.8p8.tar.gz | tar vxf -