Panelize

Panels are awesome. When opened they’re always-on-top across the bottom of the screen. They’re capable of being resized, or quickly popped down out of view. By default, the download manager, google talk and the media player display in panels, but for some reason, there's no way to load websites in panels, until now. 

With Panelize you can put anything into a standalone panel that stays visible when switching to other tabs or windows. Now you can  look up information while composing an email or document, or update Facebook or Twitter while you’re watching a YouTube video.

Download Panelize

To open your current page in a panel, just click the Panelize button and then click Reopen current tab as a panel, but be prepared to do a lot of scrolling, unless it's a mobile version of a website.

This extension supports customizable bookmarks. Add your own links to "Other Bookmarks/Panels" and they'll show up in the popup menu. On first use, you can optionally pre-populate this list with some links to panel-friendly versions of Google web apps.

The mobile versions of websites and applications work best.

Here’s a list of some mobile versions of websites you might want as panels:
Google - http://www.google.com/m
Gmail - https://mail.google.com/mail/x/gdlakb-/gp/
Google Images - http://images.google.com/m
PicasaWeb - https://picasaweb.google.com/m
Facebook - http://m.facebook.com/
Twitter - http://mobile.twitter.com/
wikipedia - http://mobile.wikipedia.org/
A google search can lead you to more mobile websites.

Discovering this extension completely changed the way I use Chrome OS. It’s a definite must have for your cr48.