What is a good KDE equivalent to gnome-do?

I would imagine it redundant to name it something under KDE4.

The behaviour I ascribe to Gnome-Do ( I haven't really used it, I'm just going by what I see on Gnome-Do's website ) is part of Kde's implicit functionality now.

Just start typing in the search field that's on the menu, or start typing in the run dialogue ( Default shortcut is Alt+F2 )

For an example of what It can do:

Alt+F2 , fire

Yeilds in the list

1. Edit - Mozilla Firefox ( Activate Running Window on Desktop 1 )
2. Mozilla Firefox ( Web Browser )

Which I can switch between with Tab and execute with Enter

You can run any command there you could run in a shell too,

trigger: Alt+F2
command: [xhost +]
shows: Run xhost +
launch: Enter

As well as running commands in a shell

trigger: Alt+F2
command: [ ls ]
shows: Run ls
navigate to execute option: Tab
open configuration instead: Space
navigate to 'run in termainal' option: Tab
toggle checkbox: Space
launch: Enter

Doing basic math:

trigger: Alt+F2
command: [1 + 1 =]
shows: 2

Spell checking:

trigger: Alt+F2
command: spell frabujous
shows: list of spellings

Open Web Searches:

trigger: Alt+F2
command: wp: duck
shows: Search Wikipedia for duck
launch: Enter

Launch Apps by Description:

trigger: Alt+F2
command: web browser
shows: list of applications that are web browsers
select one: Tab
launch: Enter

Do all sorts of web browsery things:

trigger: Alt+F2
command: stack
shows:

• Stack Overflow - Konqueror ( Activate Window Running on Desktop 1 )
• <history> stackoverflow.com /
• <bookmark> Stack Overflow

select one: Tab
launch: Enter

Filesystem Browsing:

trigger: Alt+F2
command: /tmp/
shows: Open /tmp/
launch: Enter

Do Power Controls:

trigger: Alt+F2
command: suspend shows: Suspend To Ram
launch: Enter

Its only really limited by how complete your data is and what plug-ins you have.

For KDE4: Gnome-Do = KRunner (built-in, hit Alt-F2)

For KDE3: Gnome-Do = Katapult

Gnome do works just as well in KDE as in GNOME.

From Do's homepage:

Do is just as sleek, swift and smart on KDE and other common environments.

Since you're on Ubuntu, you can install it with this command:

sudo apt-get install gnome-do