Google announced today that it has added Google Calendar data to the Gmail Search Field Trial. This is the feature that lets you search Google's regular web search and get relevant content from your Gmail account right on the main search results page.
I've been part of the field trial since the beginning, and personally, I find it to be one of the most useful things Google has done in quite some time. This notion was only amplified when Google added Drive content into the mix, and I would imagine that Calendar data would only enhance it further.
With the update, you can search for your agenda, and find appointments saved to your Google Calendar.
I should note that I've been experiencing some problems with the feature actually returning results for the past week or so. I reached out to Google about the issue, and have so far been unable to get an explanation, though I'm told nothing has changed, and it's likely something specific to my own account.
When the feature works though, it really is helpful on a daily basis.
What other Google services would you like to see implemented in this feature?