The latest verion of sudo is 1.6.9p16
The "authoritative" 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-1.6.9p16.tar.gz	Sudo version 1.6.9p16
sudo-1.6.9p16.patch.gz	Patch to update sudo 1.6.9p15 to 1.6.9p16

Note that these archives are compressed with gzip, if you don't
have a copy of gzip, download and build gzip-1.3.13.tar from the
"misc" subdirectory.  To unpack an archive, run:
    gzip -dc sudo-1.6.9p16.tar.gz | tar vxf -