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. 
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If an email message in Mail includes a Web link which you'd prefer to check out after you've read all your mail, and you don't want to hunt for the link later, Command-click the link in the message to open a browser window in the background. Mail remains the foreground application, and the browser window can wait till you're ready.
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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:
Read real-world advice from Wi-Fi wizard Glenn Fleishman on setting up a wireless network using Apple's 802.11n base stations. Learn to maximize performance, extend range, connect multiple base stations, handle complex configs, share USB disks and printers, and more. Covers AirPort Utility 6!