This update fixes proxy objects, which is huge. I haven't seen any other program come close to QS's flexibility. I can do "Current Selection > Search/Email/etc.", "Current Application > Show Menu", all kinds of cool stuff.
The last example shows all the menu items for the app in quicksilver, so I can search through it. Kind of like the search box in the app's help menu, but faster and easier (just make sure to bind that action to a key).
Select an item in finder, press [alt-cmd-space] and type "email", [tab], then type the name of the person (QS searches your address book) and then hit enter to send off.
EDIT: Not very stable though...crashed it just now when trying to use the proxy select to append to file.
The last example shows all the menu items for the app in quicksilver, so I can search through it. Kind of like the search box in the app's help menu, but faster and easier (just make sure to bind that action to a key).