If you use Chrome Canary or a recent Chromium build, you can also enable people search. This way, the app launcher shows Google+ results, just like the search box from Google.com. To enable this feature, open a new tab, copy and paste this address: chrome://flags/#enable-people-search and click "Enable" below "Enable people search - Enable searching for people directly from the apps list search". Then click the "Relaunch now" button to restart the browser.
Right now, the feature is partially implemented. While Chrome shows the search results from Google+, clicking them doesn't have any effect.
{ Thanks, MickeyJayDee. }