Google first introduced open tab syncing on the Beta channel, but now the feature is here in the stable release (Chrome version 19).
The syncing also includes back and forward history for your open tabs, so you can move from one computer to another and pick up where you left off.
The tab syncing is rolling out gradually. When it gets to you, you’ll find the option under Chrome Settings > Advanced sync settings. Update to Chrome version 19 (go to About Google Chrome to push the update) so you’ll get the feature soon.
Keeping tabs on your tabs [Google Chrome]