I just started on a project that was using trac and subversion but they weren't integrated. I love the cross referncing trac provides. It can really help explain changesets and show how an issue was resolved.

The steps to add subversion to trac are

• Stop people using the old repository
• copy the repository files from one server to the other
  I used tar and scp
• edit trac.ini to add the location of the respository
  
  Trac and svn must be on the same server
  
• run trac-admin resync
  
  This imports all the svn history.
  

I enabled access to subversion via apache SSL while I could get access via the browser checking out code with different tools gave the follwoing errors

Thanks to techpulp.com/2009/01/webdav-405-method-not-allowed-in-porpfind/ I found out that my problem was an extraneous trailing slash in my apache config!

I then ran svn relocate (right click on the repository using eclipse in the subversion perspective).

I moved Trac to SSL for good measure - changing the location on the task repository in eclipse was straightforward.

And as a finishing touch I customised Trac by adding a project logo - it goes in trac/htdocs/mylogo.png and is referenced in trac.ini as site/mylogo.png - I've failed this step before but actuallt read the docs this tim.