So I rolled Subversion 1.3.x out on http://svn.apache.org/ last night. So far so good, everything seems to be working fine, and the benefits of the new code are already quite clear in some cases. For example, you can now run 'svn diff -r 10:11 http://svn.apache.org/repos/asf' and it'll actually return an answer quite quickly, where previously it would spend forever and a day tracing back through history trying to comfirm that your target path hadn't moved in the revisions between HEAD and your targets...
The next step will be turning on Operational Logging for mod_dav_svn, so we can get some easy to parse log info about what exactly people are doing with the ASF Subversion repositories. I'm quite curious about this, so hopefully I'll be able to get some nice statistics on how our Subversion traffic looks over the course of a week or so.