I'm back with my IPerf results.

First, let me clarify that as Johnny stated, my whole point about
mentioning the CCNA was not to brag or to start the interesting
discussion re: "Do certified people know what they're doing?". I
merely wanted you to know that I know a thing or two about networking.
I should have mentioned my 7 years in the industry... I'm proud of my
certifications and can't stress enough the importance of having them
when you maintain a career in a competative environment. There's also
nothing like hands-on experience and this is how I got to my original
troubleshooting of the issue. What a beautiful mix!

Back to the results:

Internet was out of the game.
Both computers wired: 92.6 Mbits/sec
1 wireless (server) and 1 wired (client): 19 Mbits/second. The
reported connection speed at that time was 54 Mb/s.

Unfortunately, I didn't have the 2nd wireless card with me so I
couldn't run the test with both computers connected to the access
point.

So if I understand correctly (based on field experience :-) ), that
proves that my router and access points are just fine. Is there an
unusual overhead for packets from the web that are destined to a
wireless client?

I can theoretically call my ISP but they'll most likely blame it on the
Linksys equipment...

Any suggestions would be welcome.

Thanks again,
Dotan