We've showed you how to search specific sites straight from the address bar using keywords, but it turns out that same feature can be used to actually add events to Google Calendar. Here's how to do it.
This works in any browser that allows you to add search engines (like Firefox), but here's how to do it in Chrome. Right-click on the Omnibar and hit "Edit Search Engines". Hit the plus sign to create a new search engine, naming it "Add Event" (or whatever you want), making the keyword whatever you want (I've used cal) and making the link http://www.google.com/calendar/event?ctext=+%s+&action=TEMPLATE&pprop=HowCreated%3AQUICKADD.
When you're done, you should be able to type something like cal dinner at david's house from five to six pm tomorrow in the Omnibar and hit Enter. Google Calendar will open up a new page, creating an event with those qualities. Handy, huh?
This actually works with a myriad of sites, you just need to find the right link. For example, if you want to add a new task to Remember the Milk, just enter http://www.rememberthemilk.com/services/ext/addtask.rtm?d=&t=%s as the link for a new search engine. Got any other ideas of how this could be used? Share them in the comments.