Unless bandwidth and wide browser support are issues. Most of the mainline browsers can work with flash, but many browsers do not. For users on a slow link or an underpowered computer flash can be a pain.
Another solution for the email address problem could be to establish another email address, one that could be eaisly thrown away and use it in the mailto link. Using software that can limit what kinds of email that is downloadeds from the mailbox.
The solution that I like best though would be to use server side CGI scripting to handle feed back. That CGI could then forward the messages to a real email address. This way the address is never sent to the users software.
Pangor