As always, on the website we keep the master record of the snort.conf file for each version of Snort available, and keep this up to date with every supported release of Snort.
I know I'm a bit behind in moving these between servers, but here they are. Especially useful for Windows users, as the snort.conf in packaged version of Windows on the website is a bit behind. (Thanks Michael Steele for pointing that out)
Download the default snort.conf files on the website.