Work with webcam

Actually uCount does not rely on a cuecat scanner. It will work with most 1d barcode scanners that look to the web browser like a keyboard and can be configured to add a newline at the end of the scan. The only PS2 scanners we have experience with are cuecats, but we have had success with a couple of USB scanners (Motorola, Metrologic [get one with a trigger]) and are interested in exploring some CCD scanners.

The mobile_codes module looks interesting. If I read the web site correctly it will create the codes. That is half the battle, maybe the easy half.

I think the challange with the 2d barcodes will be to get them typing into the web browser. I see a few projects like this one:
http://www.cs.columbia.edu/~hgs/research/projects/iPhone-barcode/report....

This is an iPhone app. It looks like it starts the browser maybe with the URL, probably easier than running in an alternative input mode for the browser.

I would think that to integrate a webcam with a browser you would have to create a module for the browser. A quick google does not turn one up. After getting the webcam entering data then you have to worry about getting the focus in the right place so the data goes into the field you want. uCount does this with Javascript.

uCount's goal is converting over to using the barcode module, which is starting a new version. Maybe they will branch out to 2d as well.

Yes, If the flash can populate the form and submit the form you should be good to go. With these constraints, after the flash was set up I do not think you would have to touch the ucount code.

You can find an example of using a webcam with Drupal in the Webcam Trigger module.