I'm not a big fan of places that have an "auto-email" feature (it can be abused too easily), so my vote goes for either 1) Good old cut-and-paste 2)Sending the URL of the page.

On that note, perhaps a link could be added to the end of each page to allow easy bookmarking and copying of the URL without all the extra stuff (such as lastnode_id etc.) ?? I've seen this at other places - basically a simple URL that let's you refernce the current page easily.