Cool Marketing Resource - @deliverability

A Twitter account allows you to follow the thoughts and daily interactions of another individual who is also using Twitter.

For email marketing pros, I recommend following @deliverability.

You can also read the blog at www.Deliverability.com  

And here is a useful article about email deliverability:
http://www.demandgenreport.com/articles_print.php?codearti=1243