If you use Google Calendar and Gmail, you know it can be tricky to flip back and forth between the two to check your availability and schedule appointments. Boomerang Calendar (from the makers of previously mentioned Boomerang for Gmail) fixes all of that by turning any mention of a time or date in your Gmail messages into a link you can use to add an appointment to your calendar.
The links are veen highlighted red, yellow, or green so you can see if you're busy at that time, have an adjacent appointment, or free. Best of all, it recognises natural language and even corrects for time zone.
Boomerang Calendar is pretty simple to use -- check out the video above for a walkthrough. You can click any meeting to bring up a quick view of your calendar, complete with other meetings during the day, to see when you can fit in an appointment, or to add it directly to your calendar. Boomerang Calendar even fills in the details from your Gmail message, including time, location, who the meeting is with, and more, so you don't have to. If you use Boomerang for Gmail, it'll even bring the message back to your inbox before the event, or send a reminder to everyone before the event so you're all on time.
The app also lets you suggest meetings to friends and groups (even if they don't use Boomerang Calendar) by proposing times right off of your calendar, complete with a template with the location of the meeting, a Google map of the location, and all of the times you suggested. Boomerang Calendar supports Gmail and Google Apps via Google Chrome and Firefox extensions.
Note that Boomerang Calendar is in beta right now and an invite is required for access.