Quicksilver, I'm sorry, but barring a miracle, you're dead to me. After installing Snow Leopard a few weeks back, I upgraded to QS B56a7. The good news: it works; the bad news: it hogs 100 percent of my MacBook Pro's CPU. So, er, no.
Hence, it's back to Google Quick Search Box. And to be honest, I'm pretty happy with it. It works well, and after setting it up to use the same launch key combo that I used for QS, I hardly notice the difference. It lets me mount and eject disk images with a few keystrokes, just like QS. I've even managed to assign the same Command-esc shortcut to send a file (not a folder though) to QSB. Unfortunately, once there, QSB can't do anything useful with it yet. QS would let you email it or move it or make an alias of it somewhere. These are functions I would really like to see in QSB soon.
In the meantime, I'm trying to figure out how to use Automator and Snow Leopard's revamped Services menu to bridge the functionality gap between the two apps. But I'm an Automator novice and it's slow going. One thing is sure: QSB is winning over my heart.