Two neat projects I didn't knew existed
MonkeyStudio is a rather neat Qt4 IDE.
Katapult is a pretty launcher (but I wonder if it could display more than one match as I type?).
I will try to write more detailed reviews in my copious free time
Katapult is more than a launcher! Try typing in 1+1 (it does math) or start Amarok and try typing the name of a song. (You can open the configuraiton for Katapult by pressing Ctrl+C.)
Unfortunately, I don't think it displays more than one match at a time. That, and the ability to suggest things by how frequently I use them (rather than alphabetically) are my two biggest wishes.
Katapult is one of my favorite KDE applications, closely followed by Yakuake and Amarok.
About 1+1: so does the default launcher ;-)
I consider the amarok thing like "launching a song" sort of.
But yeah, pretty cool thing!