...install Fedore 15 on Dell D630 - wifi

All installed in basic distro except the firmware. Firmware can be installed using following link:
http://flakrat.blogspot.com/2010/05/how-to-enable-broadcom-bcm4312-wifi-in.html

Install Fedora 12 on Dell Latitude D630 - wifi

Update: see update for Fedora 15

After short struggling wifi is now working well. I have used ndiswrapper and Dell driver (use service tag to find it). For me it was ftp://ftp.us.dell.com/network/R242906.exe. Open the downloaded file using file-roller (archive manager) and extract bcmwl4.inf and bcmwl5.sys.
After installing ndiswrapper packages following commands installed the card:

ndiswrapper -i bcmwl5.inf
ndiswrapper -m 
ndiswrapper -l

The last command shall say something similar to:

bcmwl5 : driver installed
 device (14E4:4328) present (alternate driver: ssb)

Now add line ndiswrapper to /etc/modules and a line

blacklist ssb

into /etc/modprobe.d/blacklist.conf.

Try modprobe ndiswrapper now and see whether NetworkManager will detect wifi networks in the range .