Google recently tested a new interface for search results. The test didn't include any new feature and Google even loaded the standard search results page to display the results. An important notable change is the new format was that Google didn't load a new page to display the results and browsers didn't send proper referrals when clicking on search results.
Yahoo! Zimbra Desktop - It's an offline capable client so you can take your data with you whenever you don't have internet access powerd with Ajax technology. Working offline is major feature integrated with Zimbra soon after Google adding offline access through open source gear projects. You can access Zimbra Mail. Yahoo! Mail. Gmail. AOL in one common place. Even Outlook and other business e-mail account can be accessed using POP or IMAP.