currently you can't attach them because they will go over the limit, which is designed for pictures - i could change that limit, but it is a good idea to force people to keep their pictures within a size limit.
What you need to do is convet them to mp3 - that is a topic on its own, then upload to a server (lori you can use your folder on buriedshiva) with a program like SmartFTP (free) or just drag drop into ftp browser window, then link it here:
[url=http://www.ned.org.au/clips/shadow.mp3]Shadow[/url]
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Shadowthen click, or select save link/target as... and download
Rudi's new feature will make this easier