Add tags simply in the subject of your email using the syntax ((tag: apple, gadgets)). You can see your tags on the homepage of your site and click on them to see those posts. You can also see what people are saying about any given topic.
Instant audio podcast
Your RSS feed at http://yournamehere.posterous.com/rss doubles as an iTunes-ready podcast feed. Just attach an mp3 to an email and you’re good to go. Link to itpc://yournamehere.posterous.com/rss and let your friends subscribe in iTunes directly.
Custom domain names (yournamehere.com)
Got a domain name already? Want to use it with your posterous? No sweat — just set up the DNS and run with it.
Remove your email signature
End your post with ‘