The uploading rosters feature is ready for testing! Here's how the process works:

Hit the Choose Roster option in the simulator's menu, and then choose Upload Roster.

Follow the instructions off the page and upload the three files from a franchise, roster, or superstar file (Madden 08-style). Once you start the upload, my app will verify that your files have valid columns and data and may complain about something like if the PLAY file has repeat Player IDs or invalid symbols in the PFNA/PLNA columns. To prevent SQL injection, I won't allow certain symbols like the backtick (`) and others, so please ensure your files do not have these.
Also, ensure your depth charts have been updated or simming games will fail!Once the uploading process is complete, you can return to the Choose Roster page and select your new submission. From there, I recommend updating the Coach Sliders and perhaps the Depth Chart, and then sim away!
For right now, I am requiring that you log into my app to be granted the privilege of uploading rosters. Please send me a PM and I will give you a UserID and Password that you can log in with. This process isn't perfect and needs refinement, so please let me know if you run into any bugs.