While tinkering in Quicksilver's plug-ins panel this morning I came across two new plug-ins that should fit right in with my new
The Google Calendar module seems to use their Quick Add syntax for adding events. For a quick tutorial on this: invoke Quicksilver and then hit period so you can begin entering plain text. Enter something like "Apple Store Opening Saturday 10 am," then hit tab to move to Quicksilver's second pane to chose an action. If you have the Google Calendar module installed, the action is titled "Google Calendar Event" (using 'gcal' works just fine for me). Hitting enter will send the event, and for bonus points, if you have Growl installed and Quicksilver using it to give notifications, you'll receive a Growl alert upon successful completion.
The Gmail module (pictured) allows you to compose a message (or at least part of one) using the same method as both the Google Calendar and Mail.app compose actions. Once you type some text, tab over to chose the Gmail action, you'll receive a 3rd pane that allows you to specify an Address Book contact to send to. Hitting enter will create a Gmail compose window with all the information you chose from Quicksilver already inserted. Awesome.