create report from selected rows in a view

Hi, I'd like to be able to generate reports from selected/checked rows in a view. Here's a very simple example. We have a DB with an email address field in each record. I would like to be able to select a subset of the rows in a view, and click a button to get a text box with the email addresses, comma separated and ready to be copy-pasted into an email program. I've got the Deluge script working to send canned (or customized) messages to each selected address, so I understand something about how Deluge works, but I'm not sure how to do this. It seems I need a way to do two things. First, I need to loop over all selected entries and collect the addresses. I'm not really sure where to do that. The Custom Actions seem to have an implicit loop. And there are no other hooks for actions in views, are there? Second, I need to generate for the user some sort of text box. A popup box like your Alert box would be fine, except that it seems to be limited to validation.

Any suggestions? Thank you!