I found a different binary at Martin Ott's site. I have no idea why his site isn't linked from Subversion's, but his binary is 1.4.3, the latest.
Simply run the installer in his package, and it will do ALMOST all that's needed. However, you still won't be able to run svn from the command-line, because the package installs it in /usr/local/bin, and that path isn't in Apple's default.
For those new to the terminal, the path variable is a list of directories where OS X should look for applications. This applies only to the command line. For instance, if you type "ls" on the command line, it will look for the "ls" program in each directory listed in the path. Since it finds it in /bin, it will run ls. The path is why running "ls" is the same as running "/bin/ls".
To find out what your path is currently, enter the following command:
(Capitalization does matter.)
To add /usr/bin/local to your path, copy and paste the following line into your terminal:
echo "export PATH=$PATH:/usr/local/bin" \>\> \~/.profile
This will not affect the shell you're running now, so type "exit" to leave the shell. Then hit CMD-N to get a new terminal, and type "svn"
You should get a message telling you to type "svn help" for more information. Success, svn is installed and configured properly.