Control-Shift-T (Command-Shift-T if you are on a MAC) will reopen your closed tab. In fact, it will reopen the last several tabs - I've heard people say it only opens the last 10 tabs, but I've tested it to 17. It didn't stop working at that point, I just stopped trying. I figure if you are going back that far, you may as well just look into your browser's history, it would probably be easier.
You can also click on the menu button and choose "Recent Tabs". You can even access recently closed tabs from another computer as long as you were logged into Chrome on that machine.
That's my quick tip for you today! This has saved me many times. I hope it comes in handy for you!
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Keyboard Image By Rumudiez (Created in Adobe Illustrator) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons