They tested both the iPad Wi-Fi only and the iPad 3G using a series of six tests at different distances and with varying interference.
In order to keep things simple, we focused on speed. The test is a mix of content download as well as raw http performance tests via speedtest.net, repeated 10 times for each test, and averaged out (normalized to a scale going from 0 to 100, 100 representing the best throughput we could measure).
Their results show a performance improvement of at least 20% using the 3.2.1 firmware. Take a look at the chart below...
Read More [via iPadevice]