I think all of you know the problem of losing all applications after updating the firmware. You have to install each application once again which takes a long time. However, now Vaibhav over at The Symbian Blog, has found a great freeware application called InstFast. It reinstalls the applications after a firmware update. Therefore you have to place the sis, sisx and jar files in a folder and InstFast will install them. However, you have to sign the application with your developer certificate before installation. Unfortunately you have to change your phone´s date back to a point before 31.12.07, otherwise the application won´t work.
Source: The Symbian Blog