I frequently receive emails in Mail.app that have four or five files attached to them (spreadsheets, docs, PDFs, etc). Often I just need to forward one of those attachments on to a colleague. If you highlight just the attachment(s) you want to forward, then click the Forward button, the new email message will contain just the files you've selected as attachments.
[robg adds: This behavior is standard for text, in both forwarding and replying, but I didn't know it worked for attachments as well.]
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http://hints.macworld.com/article.php?story=20060517072306802