Ready to use sites
If it is easy to do with your law firm extranet solution (and if there are no incremental costs), consider building law firm extranet sites for all of your key law firm clients. By doing this, you can ensure that there is always a collaboration area ready to use at a moment's notice by any of your key internet clients (partners).
Doing this also helps reduce the perception or the belief that setting up additional law firm extranet environments is a costly and time consuming endeavor.