SVN stands for 'SubVersioN' and is a source code control system. Cavedude posted about it here:
http://eqemulator.net/forums/showthread.php?t=26376
Anyone can check-out the source code from there, and there are also occasional Win32 binary releases (click on the download tab). Every time new code is checked in, the 'Revision Number' bumps up by one. If you click on the 'Source' tab and then click on Changes, you can see a list of changes in each revision. As I am writing this, the latest revision is r29, but the latest Win32 binaries is r27. If you can't compile yourself, you'll need to wait until there is a revision29.zip (or later). The Win32 binaries on that site have to be created manually, so I can't say when the next one will be released.