As of this week, Gmail has reached perfection: You no longer have to be online to read or write messages. Desktop programs like Microsoft Outlook have always been able to access your old mail. There is a certain bliss to this; if you've got a pile of letters that demand well-composed, delicate responses (say you're explaining to your boss why you ordered that $85,000 rug), unplugging the Internet can be the fastest way to get things done. That's why offline access is a killer feature—it destroys your last remaining reason for suffering through a desktop e-mail program.