Just a simple plasmoid i coded up in 15 min to save me some time.
I built it with KDE 4.1.4 but it should work fine with KDE 4.2.
1.Just type the search term and press ENTER.
2.The default search option is set to use google and opens the results page in Konqueror.
3.To use Wikipedia,type:
w search term here
4.To use IMDB ,type:
i search term here
5.To use yahoo,type:
y search term here
6.To use Google(the default),type:
g search term here
As you can see all the options are hard coded,so it is not possible to add or remove search engines at the moment.
If u like to improve this , your are free to do so.
Install instructions in source.