UPDATE -  I was able to fix the connectivity issue.  Dell shipped me a new card, I opened up the laptop to install it and discovered the one of the antenna wires was not connected.  I had never installed an internal wireless card before and had no idea that the antenna connection would be a possible issue.
I just recieved my new Laptop a couple days ago.  Dell XPS L502X, 64 Bit Windows 7 Ultimate.  With Intel Centrino Advanced-N 6230 wireless adaptor. When connecting to my router which is a Linksys Wireless G (WRT54GS v5), My signal strength is rated at Poor.  I have multiple devices that can connect to this same router and get excellent signal strength.  I live in a condo and am sitting 5 feet from the router in the same room.  My  Dell 700M with XP can see 10 other wireless networks when looking for a network and my new computer only sees 2.  Related to this, I have run the Intel Wireless Display software to configure the wireless adaptor and it does not recognize the adaptor.  But when I run the intel diagnostics tool it is able to give a report that the adaptor is working but the signal strength is poor.   Does this sound like a hardware issue or a software issue?  I chatted with the Dell support guy and he said it was software since the wireless card was picking up the router.   I have verified the most recent drivers are installed.  I even uninstalled and reinstalled the drivers and received the same results.   I see on the intel forums that there are some other issues with the 6230 adaptor.  Any suggestions?   Thanks,Jason
Wireless Signal Strength Issues with new XPS L502X and Intel Centrino 
Advanced-N 6230