Seems like the Gecko 540 is the most popular board discussed on this board these days, yet the Gecko is only parallel port compatible, in spite of the fact that new computers don't come with parallel ports. The "solution" to this problem is to spend another $150 for a device that needs to be soldered into your Gecko board. That's not a solution that just anyone can use. I'm a woodworker. Haven't touched a solder gun since I was a teenager over 20 years ago.
What else is out there?