240 x 320 (small phone)

320 x 480 (iPhone)

480 x 640 (small tablet)

768 x 1024 (iPad - Portrait)

1024 x 768 (iPad - Landscape)

A super web tool courtesy of Matt Kersley - Note: The content width may not be pixel perfect - 15px have been added to the iframes to cater for the scrollbars