Playstation 3 firmware version 1.93 is now available for download. However, it seems that people are having connectivity issues in an attempt to download the newest firmware. The following link takes you to the official Playstation forums were you can read accounts of download issues.
Also, here is the following error statement some users recieved while downloading:
An error occured during the download operation. A connection to the server cannot be established.(80028E07)Seems odd, hopefully it will be fixed. But since the update is released now, when are the themes going to appear on the store?
[Via PlayStation Boards]