Session Buddy is a killer session management extension for Google Chrome
Once installed, you can save and restore tabs and windows from previous browsing sessions. You can also remove specific tabs or windows prior to restoring -- just in case there are pages you don't need to reopen. By default, Session Buddy restores windows exactly the way you had them, but you can also choose to open everything in a single new window or in the currently active window.
You can also create new sessions by manually entering a list of URLs in Session Buddy's options screen. It's a handy way to set up windows and tabs for news reading forays, time wasting on your favorite LOL-worthy sites, or getting right down to business with your favorite web apps.
You're not just stuck with a list of timestamped sessions, either: Session Buddy lets you specify names for easy recall.
Clicking the "update snapshot" link quickly saves your current Chrome session, and you can also export (to plain text or CSV) and import sessions -- useful if you want to pick up where you left off on a different computer.
I'd love to see the developer plug Session Buddy into Chrome's sync framework as the Fresh Start extension does. With that added, Session Buddy would easily be among my top 5 Chrome extensions.