I have a Dell Latitude D610 with a built-in wifi card, however as of yet I have not been able to get it to work with Fedora linux. Is there a specific driver for Linux that I need to install so I can use it? I used to have Windows XP on the laptop and the wifi card worked, so I know that it isn't physically broken. Any ideas?

Well, lets start with the basics. We really need to know what chipset is running in that thing, so if you'd post the output of lspci, we can probably give you some pointers from there.

Sorry for the delay, I had ISP issues but have changed providers now, so I am back online again. Here is the information that you requested, hopefully this will help you being able to tell me what I need to do to get my WiFi working using Linux: (Also, I mis-spoke/typed, its a Dell Inspiron 600m, not a Latitude D610. Didn't have it in front of me when I created the first post...)

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# lspci
00:00.0 Host bridge: Intel Corporation 82855PM Processor to I/O Controller (rev 03)
00:01.0 PCI bridge: Intel Corporation 82855PM Processor to AGP Controller (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corporation 82801DBM (ICH4-M) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE Controller (rev 01)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
00:1f.6 Modem: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Modem Controller (rev 01)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV250 [Mobility FireGL 9000] (rev 02)
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5705M Gigabit Ethernet (rev 01)
02:01.0 CardBus bridge: O2 Micro, Inc. OZ711EC1 SmartCardBus Controller (rev 20)
02:01.1 CardBus bridge: O2 Micro, Inc. OZ711EC1 SmartCardBus Controller (rev 20)
02:03.0 Network controller: Broadcom Corporation BCM4306 802.11b/g Wireless LAN Controller (rev 03)

That is your wireless card. Since it is a 4306, the b43 driver in the kernel should work, once you've installed the firmware. There are pretty good instructions for how to do that here at the b43 site.

The b43 driver is one of the most confusing ones out there because the kernel module is open source (and hence can be distributed by a distro), but the firmware required for the card to operate can't be distributed because of Broadcom licensing restrictions. You end up with a situation where it looks like the card is there, but it doesn't work.

fwcutter was already installed, I found out after I tried to reinstall it...
I did these commands, as instructed from the web page:

modprobe -r wl
echo "blacklist wl" >> /etc/modprobe.d/blacklist
modprobe b43
wpa_supplicant -iwlan0 -Dwext -c/etc/wpa_supplement.conf

Still no wireless... Any ideas whatn it still could be?

OK, but did you do the next steps and use it to create the necessary firmware files and put them in the proper location? Those are the critical steps, fwcutter by itself does nothing.

You also might have a look in your log files (/var/log) and see if b43 is complaining about anything.