Hardware site AnandTech has posted an extensive review of the fifth generation AirPort Extreme base station and the fourth generation Time Capsule, and while you may not want to read the entire 9-page review, it's worth popping to the end, where author Brian Klug explains how an internal hardware change (from Marvell to Broadcom) gives these new models improved throughput and range. follow link
Easy Fetch Upload
If you want to upload an open file (e.g. in Photoshop or BBEdit) to a remote server via the Fetch FTP client, you can use drag-and drop without switching to the Finder. Just drag the small document icon in the window title bar to a Fetch window. If the icon won't drag, make sure the file is saved.
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New AirPort Extreme and Time Capsule Feature Improved Throughput
Check out the Take Control ebooks that expand on the topic in this article: