Can anyone recommend a Windows SVN repository browser without shell integration?
I need it to be portable (carry with me on a flash drive), therefore without an installation process. This rules out TortoiseSVN.
My repositories are local, so I need a tool that can access a file repository.
With portable you mean that you can run it from a USB drive?
The other TortoiseSVN-like program that I know of on Windows is SmartSVN, but i) I don't know if you can install it on a thumb drive, and ii) I'm not entirely sure if it's freeware or not (there's definitely a free trial option).
One alternative that should work from a thumb drive is installing Cygwin and using the svn command line tool. Obviously you're not getting a graphical tool in this case, but it should run quite happily from a thumb drive.
If you want to be really portable then your best bet is to get use to using the Subversion command line tools. You can do everything you'll need to with them and they'll be the same on every platform that subversion is available before.
Take a look at Subcommander. Although it is delivered in installer, I'm sure you can rip the binaries from installed version, or take the sources and compile it yourself.
Maybe PySVN Work Bench is what you are looking for: http://pysvn.tigris.org
If you go to http://portableapps.com/node/13470 you will find exactly what you are looking for - RapidSVN Portable. Be sure to use the PAF installer.
SmartSVN: http://www.syntevo.com/smartsvn/index.html