Here's a couple of helpful hints:
1. Install the software first!!! Do not plug the card into your Axim as soon as you get it!
2. You may need to configure your wi-fi router to accept the connection using the MAC IP address (this is located on the lable on the CF card) - I have a very simple setup with a Netgear wifi router, I had to go into the router settings and allow the connection.
3. If you are having trouble trying to wireless activesync disable your firewall for a minute and try it again.

I spent countless hours trying to get the cards to work and I realized that I shouldn't have to spent this much time everytime I want to go wireless.

Linksys really needs to realize that If the card doesn't work with the DELL then they need to stop offering it until they are 100% sure it will work.

Now I'm searching for a card that will work with the DELL. My feeling is this, when I want to go wireless I should be able to plug in the card and it should work and that's all there is to it!

This card does not work on the Dell Axim with Windows Pocket PC 2003! I was able to test in on another Dell that happened to be running ppc2002 and it installed flawlessly.

I can't say whether it works with other pocket pc's running 2003...

I read the reviews here and other websites, but it only got mediocre ratings. I also read in some cases that it didn't work with the Dell Axim. Well, it does after you download the latest driver software from Linksys' website (my driver version that I'm using is 1.0.7). Just follow the quick guide and setup shouldn't take more than 5 - 10 minutes. I think the problems some people may have with setting the CF up was that they didn't follow the instructions step by step: i.e., if you plug in the CF card into your PDA BEFORE setting up the driver, your PDA automatically configures the CF's settings (incorrectly I might add), which prevents it from working.

Very simple to set up. However, like some others mentioned before, the card does get pretty warm when its on. Sucks up battery life too pretty quickly, but that's to be expected from any CF wireless card.

I've been searching quite a few CF wireless cards before I got the Linksys WCF12, including Netgear's version and Linksys' older WCF11 card, but the WCF12 seems to work great with the Dell Axim.

It does suck quite a bit of power. I would recommend having a good battery in your unit (in my case I have an extra one in the PDA compact flash sleeve).

Range is fine. I can use it anywhere in or around my 2700 sqft two story house.

This is what I added to /etc/pcmcia/wlan-ng.conf to get it working:
card" My nifty WCF12 wireless card"
manfid 0x028a, 0x0673
bind "prism2_cs"

It is signifigantly easier to type in using that itty-bitty keyboard! I didn't come up with it, just found it.

big thumbs down, it's getting sent straight back where it came from.

The windows drivers simply do not work. They have never worked -- regardless of upgrade. I've tried the WCF12 in two Compaq/HP Ipaq's (36xx, 38xx) and a few Dell laptops, all with no success. Linksys's technical phone support was less than useful, repeatedly offering me the same drivers I could download on the website. Their email support didn't fare much better, responding each time with a different and incorrect canned response.

I'd highly recommend ditching and not buying linksys gear for the end-unit. Their Wireless Access Points and Cable/DSL Routers are solid and fairly functional -- But virtually all of their PC-side gear (PC Cards, PCI Cards, CF Cards) borders on un-useable. Between the lack of (Competent?) Technical support and twitchy drivers, I'm ebaying off all of my Linksys gear. ;)