I am actually running Tilda (F1) and Yakuake (F12) at the same time without any problems.
I like Tilda better in one respect, I can move the window to any location... but Yakuake looks a lot nicer than Tilda.
yakuake-2.8-beta1.tar.bz2 (local) / yakuake-2.8-beta1.tar.bz2 (remote)
Extract & Install
Extract the files, then go in to the yakuake-2.8-beta1 folder and type:
./configure && make && sudo make install