先谢谢楼上的各位同志，无线网卡的问题解决了！
讲下我解决的步骤：
下载 iwlwifi-5000-ucode-5.4.A.11.tar.gz 包：
QUOTE:$ wget
http://intellinuxwireless.org/iw ... ode-5.4.A.11.tar.gz
解压 iwlwifi-5000-ucode-5.4.A.11.tar.gz 到 /lib/firmware 目录：
QUOTE:$ su
# tar xvf iwlwifi-5000-ucode-5.4.A.11.tar.gz --strip 1 -C /lib/firmware iwlwifi-5000-ucode-5.4.A.11/iwlwifi-5000-1.ucode
修改 /etc/apt/sources.list 文件，加入下面源：
QUOTE:# Debian Kernel Snapshots (experimental!)
deb
http://kernel-archive.buildserver.net/debian-kernel sid main
导入key文件：
QUOTE:# wget -q -O -
http://kernel-archive.buildserver.net/key | apt-key add -
更新源，安装2.6.29-1-686内核及工具：
QUOTE:# aptitude update
# aptitude install linux-image-2.6.29-1-686 wireless-tools
重启电脑，并以2.6.29-1-686内核进入系统：
加载 iwlagn 模块：
QUOTE:$ su
# modprobe iwlagn
用iwconfig就可以显示当前系统中无线网卡信息：
QUOTE:debian:~# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wmaster0 no wireless extensions.
wlan0 IEEE 802.11abgn ESSID:"tp"
Mode:Managed Frequency:2.437 GHz Access Point: 00:23:CD:70:AD:36
Bit Rate=1 Mb/s Tx-Power=15 dBm
Retry min limit:7 RTS thrff Fragment thr=2352 B
Encryption key:6C69-6E75-78 Security mode:restricted
Power Managementff
Link Quality=100/100 Signal level:-23 dBm Noise level=-86 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
debian:~#
查看附近可用的无线网络接入点：
QUOTE:debian:~# iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:23:CD:70:AD:36
ESSID:"tp"
Mode:Master
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=100/100 Signal level:-27 dBm Noise level=-86 dBm
Encryption keyn
IE: Unknown: 00027470
IE: Unknown: 010882848B960C183048
IE: Unknown: 030106
IE: Unknown: 2A0100
IE: Unknown: 32041224606C
IE: Unknown: DD0900037F01010008FF7F
IE: Unknown: DD1A00037F03010000000023CD70AD360223CD70AD3664002C010808
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
48 Mb/s; 54 Mb/s
Extra:tsf=0000000188283181
Extra: Last beacon: 16ms ago
Cell 02 - Address: 00:19:E0:ED:F8:28
ESSID:"liu"
Mode:Master
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=51/100 Signal level:-78 dBm Noise level=-127 dBm
Encryption keyff
IE: Unknown: 00036C6975
IE: Unknown: 010882848B960C183048
IE: Unknown: 030106
IE: Unknown: 0706434E20010D14
IE: Unknown: 2A0100
IE: Unknown: 32041224606C
IE: Unknown: DD0900037F0101001FFF7F
IE: Unknown: DD0C00037F020101000002A34000
IE: Unknown: DD1A00037F03010000000019E0EDF8280219E0EDF82864002C011F08
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
48 Mb/s; 54 Mb/s
Extra:tsf=0000000175f42715
Extra: Last beacon: 3076ms ago
debian:~#
我这里搜索到两个接入点，一个是tp（这是我的局域网的），另一个lin是别人的，不知道是谁的，开了广播功能，又没设置安全功能，呵呵！
激活无线接口：
QUOTE:ifconfig wlan0 up
获取IP地址：
QUOTE:debian:~# dhclient wlan0
There is already a pid file /var/run/dhclient.pid with pid 12547
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.1.1
Copyright 2004-2008 Internet Systems Consortium.
All rights reserved.
For info, please visit
http://www.isc.org/sw/dhcp/wmaster0: unknown hardware address type 801
wmaster0: unknown hardware address type 801
Listening on LPF/wlan0/00:21:6b:12:e5:0e
Sending on LPF/wlan0/00:21:6b:12:e5:0e
Sending on Socket/fallback
DHCPREQUEST on wlan0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.1
bound to 192.168.1.101 -- renewal in 3002 seconds.
打开“系统”->“系统管理”->“网络”，我的设置如下图，自己根据自己的情况设置：
下载 (84.06 KB)
2009-04-13 20:05
我在google中搜索到下面两个文章，然后折腾了几个小时后才成功的，成功的瞬间真的好兴奋！
http://wiki.debian.org/iwlagn#Lenny 安装驱动大部份看的这个。
http://www.91linux.com/html/linux_pub/ubuntu/20070430/1931.html 设置方面看的这个。
没说好的地方，请高手指点，大家学习交流！
