I've got my Broadcom WIFI card driver working via ndiswrapper, and I've configured the network with iwconfig.
I am running a managed network with WEP and no SSID broadcast, and it all shows up good with iwconfig wlan0 and in my WIFI monitor.

The problem is that even though everything shows I am connected to the network my web browser doesn't think so, and I cannot ping the router.
When I do a iwconfig wlan0 I notice it always shows a number by Invalid misc: . The number grows each time I run iwconfig wlan0.
So I believe it is communicating, but the packets are not being accepted or something.

Thankful for any help!

It may be that you need an ip address for wlan0. For example, I am using ndiswrapper on my laptop, after configuring drivers and connecting to the network, I use the following to get an ip address using dhcp.

That did the trick! I can't tell you how much time I've spent trying to get ndiswrapper working only to come to this brick wall (earlier version wouldn't work, had to find 64bit drivers, etc...).
Now, I am sending this via WIFI from my SUSE linux laptop. Thank you very much!!

may I ask what broadcom card is it?
cause i'm having some trouble with mine ><

It is a Broadcom Air Force One 54g (BCM4318). To get it to work I had to
- download and compile the latest ndiswrapper release (v1.5)
- get drivers for the WIFI card (64bit in my case)
- configure via iwconfig wlan0. here's what I did:
iwconfig wlan0 essid [ESSID]
iwconfig wlan0 key restricted [MYPASSCODE]
iwconfig wlan0 channel 6
iwconfig wlan0 mode Managed
iwconfig wlan0 ap [ROUTER'S MAC ADDRESS]
iwconfig wlan0 nickname "home"
iwconfig wlan0 rate auto
- bring up with ifconfig wlan0 up
- start DHCP for wlan0 (as cybrog has shown above):
dhcpcd -d -t 10 wlan0
if it shows:
**** dhcpcd: already running
**** dhcpcd: if not then delete /var/run//dhcpcd-wlan0.pid file
just delete the dhcpcd-wlan0.pid file, and try again