SVN Manager
I believe a lot of people start using Subversion now a day. Do you have any problem for manage more that 1000 people or more using subversion? I suggest you try SVNManager (web based).

SVNManager is a web based tool to administer a Unix/Linux Apache WebDAV Subversion repository server.
With SVNManager, you can remotely:
- Create, remove, load and dump repositories
- Manage user accounts for access to the repositories
- Manage groups for acces to the repositories
- Invite users by email to create an account on the server
- Requirements:
- Windows or *nix Operation System
- Apache 2
- Subversion
- PHP 5 + Pear + VersionControl_SVN
- MySQL/SQLlite
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