There are two new files in the Piano Owner's Guide to Repair - if the black keys on your piano are looking worse for wear, you'll want to investigate "Restoring your Black Keys."
The other file describes the installation of the Universal Bass String - these are strings that are used to first, replace the broken bass string in the piano. It can be used as a temporary solution until a custom built replacement string can be ordered and installed.
Notes From the Piano Bench
Questions and Answers and updated factoids concerning pianos in the 21st Century.