well first off, i want to say i love quicksilver. before that i used butler (another amazing application). these latest betas though have been painful. QS seems to constantly quit/crash on me for no apparent reason. its memory usage also seems to balloon out over time, so when it's not quitting on its own. i quit and re-start it just to reclaim the 256M of RAM it sucked up (initial launch eats up only about 50M). a great app, but seems there are some new bugs that need to be squashed. i still recommend it though.