I was wondering if anyone would know if it would be ok to use this nice little piece of code for putting a "share this" link button on customized page. I tried it once and it seemed to work...just wondering if anyone else has some experience with it. Here is the link: http://www.addthis.com/
It's quite common and I'd reccomend its use, especially if you're audience meets the criteria. Obviously via email it'd have to be linked to the custom page like you suggest.