Just thought I would share this with everyone. I just found out I could do this.
You can send your PAGES documents to your Box.net account using the COPY TO WEBDAV feature in Pages.
Choose the COPY TO WEBDAV option and you will be prompted for your WebDAV server information. For Box.net it is as follows:
https://www.box.net/dav//Documents Documents is the name of one of the folders in my Box.net account. The double // is important. Also enter your username and password. That's it. You can now upload documents directly from Pages to your Box.net account. Pages also gives you the option to convert the document to PDF or Word format or keep it in Pages format when it copies it.