Leopard upgrade kills wireless

There are certain segments of Mac users who are reporting a number of problems concerning their wireless connections after upgrading to Leopard – and one of the biggest problems faced so far is the steady degradation of their wireless link. The transmit rate starts up at 54 (assuming you’re using the 54g standard), and once you start downloading or experience LAN traffic, the transmit rate will drop slowly and surely to the point where your browser can’t even load a single page. To date, Apple has not posted a support document addressing this problem, neither is there a fix in sight. Are there any Leopard users out there who have experienced this?

Update 11/15: Apple has an 10.5.1 update that might fix some of these problems. Let us know.