You're using the wrong LinkStick. For the 2008 "A" models, you need the WIS08ABG Linkstick. The WIS09ABGN Linkstick isn't compatible.
If you can return the LinkStick from where you bought it, do so. Then, email me at LSforumcontest@gmail.com and I'll mail you one free of charge.
I only have one left, so please include your name, address, CNET user name, model and serial number for your television, and I'll get that out to you this week.
I recently purchased a Samsung LN52A850 along with a WIS09ABGN Link Stick. When I plug in the Link Stick, I would expect to see a screen prompt " Wireless network device is connected ... Current network setup: Cable ... Switch network setup to wireless: yes/no ". In my case there is no such prompt. I've successfully used a USB storage device in Wiselink which indicates that the USB port on the TV is working. If I plug the Link Stick into my laptop USB, it recognizes a 802.11 N compliant device which might indicate the Link Stick is working. What might I try next?