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In other words, if you serve a website or otherwise want to allow incoming connections, you are better served sticking with firmware 2.3.0(2), rather than the newer 2.3.0(7) firmware.
To test this, you can, as I did, upgrade the 5660 router to the 2.3.0(7) image, and monitor your website. I noticed that I got occasional failures to the linux-box webserver when my main laptop was offline, such as at night or during trips. A monitor for outgoing connections showed no problem. My main laptop always seeks to connect to MSN, exercising the new application-level routing features in the 2.3.0(7) firmware. I went many rounds of testing alternative theories before flashing a backup router to 2.3.0(2) for a comparison--problem solved.
Stick with 2.3.0(2) if you have a website served by the 5660 router.