Googling around shows that lots of people get it working fine. I'm presuming that I'm somehow omiting a step or an obscure setting leading to my dismay.
In the worst-case scenario, I can enable my router's "guest access" which effectively broadcasts a different SSID and computers (or blackberries) that connect to it (via a PSK authentication) have internet access, but not access to other computers on the LAN.
Believe me, I realize I'm being a bit pig-headed about the security thing, and that the facts are against meabout SSID hiding, but it's the way I've got my network set up, it works, I like it, and all other devices work fine in the environment. I'm sure there's some way to get it working with the 8820. Hopefully a reader here can steer me in the correct direction. Meanwhile, Daphne thanks for the good references. Appreciated.