PDAs, for the most part, lack USB ports, and due to the lack of hardware and driver support you cannot connect a standard webcam to a PDA. What you'd be looking for there would be a uPC (ultra portable computer), which is like a cross between a PDA and a laptop and costs upwards of a grand.
However, there are cameras available for PDAs that connect using the CF or SD memory card slot. A quick internet search will turn up a host of results, each one designated to work with certain PDAs. In your case you may want to shop for the camera accessory and then choose a matching PDA. Getting it to stream back to your computer so you can display it on a webpage, however, would be a little tricky and the quality wouldn't be great....you'd be better off with still photos.
I saw your posts in the other forums, and based on what you need to accomplish I don't think a PDA would be your best option. It may seem odd, but I think your best bet is to pick up a wireless security/surveillance camera, once that sends the signal to your computer. That would produce a decent quality image, be fairly easy to carry around, and natively stream it to your computer for a webcast. For that I cannot make any suggestions as to a specific one, but you should find plenty of options through an internet search. (The Home audio & video forum may also be able to help find one that meets your needs.)
Hope this helps,
I was wondering if anyone knew of any specific PDAs that are compatible with a high end webcams. I'm a little back on the technology recently and I'm not sure if new PDAs have USB ports that allow for a webcam plugin?
Also, would it be possible for me to stream live video from a portable PDA through a broadband card? What would be the best way to go about to streaming live video from a PDA webcam?