Version: (using Devel) OS: Linux Installed from: Compiled sources I did extensively on a daily basis the silence or activity notifications for the following: - be notified when a compilation finishes - be notified when a server finishes a reboot - be notified when a new log line appears - be notified then a sniffed packet is captured - etc... I also used the "send to all sessions" quite a lot to perform simple tasks on groups of servers. I think for multitasking oriented people those were great features and personally they're the features I miss the most in KDE4.
I think those features are all available in recent version.