It's quite the pain in the ass to manually propset for each new file added.

Edit the file .subversion/config and scroll down towards the bottom... find the [miscellany] block and uncomment the line enable-auto-props = true

In the group of options below titled [auto-props] and add a line like:

* = svn:keywords=Id Date LastChangedBy Revision

Related posts:

1. SVN Keyword Substitution svn:keywords
2. Backing Up Subversion Repositories Using svnadmin hotcopy
3. Deployment Using Capistrano / Webistrano via Rails / Phusion Passenger