Much like the BlackBerry, the T-Mobile Sidekick ($249) is a dedicated mobile e-mail device. The screen, which in normal mode covers the keyboard but can be flipped out, is more color-rich and detailed than the Handspring Treo 600's screen. The keyboard is roomy and easy to use. And in reading mode, you can scroll through e-mails and menus without having to flip open the screen.

The e-mail interface is easy to navigate. One drawback, however, is that the Sidekick gives you access only to the built-in account and three POP3 or IMAP accounts; you can't get corporate mail on it.

The Sidekick can open Word and PDF attachments (though you can view their content only as plain text), play sound file attachments, and display images embedded in or attached to messages.