Out of all the people I have talked to, only one said that the new AirPort 3.4 software did NOT degrade their signal strength. My dad installed it, and had to revert back to 3.3.1, which is not a fun thing to do. So if you have not installed version 3.4 yet, don't. If you have and want to get good signal strength back, check out xlr8yourmac's guide to restoring version 3.3.1.
