Not sure what you did, but presumably you can still access the router over telnet and make some corrections (e.g., stop your errant port 80 process, restart webserver, etc.). Worst case, do a 30-30-30 reset. Btw, you can back up the current config from telnet session using:
nvram backup <filename>
Hopefully you can export it w/ ssh, ftp, smb, etc.