I am developing a ASP.NET web site where users will need to be able to create their own business cards. So, I'm looking for a tool (most likely Flash) that I can easily integrate into a web site and lets users add text and custom images to their cards and then create an image and/or PDF from their work.
is there a plugin that does this?
You could have a look at this: http://www.shirtnetwork.com/en
It is less of a plugin and much more of a fully customizable software solution, with an administration backend, PDF export, billing etc. . I worked on the client and I must say it is a very mature and potent software and probably can do about anything you want, when it comes to customizing products. I don't know, whether you like the pricing model, OTOH to my knowledge, they also provide provision-free licences.
I don't know, whether there are reasonbly expensive components available, that do this for you, because you can get a load of money out of this business, so I wouldn't expect anyone to give them away for free.
greetz
back2dos