Getting free tools and books via twitter

For all of you manager-tools followers, (I'm one too!) I thought I'd post a quick note about twitter. I use it to keep a loose connection to my friends and acquaintences and hopefully to move some of the information firehose known as "email" into a more appropriate tool. Twitter can help to get your inbox to zero too!
But it is not all noise, today I found out:

• I could get a free copy of "The Art & Science of CSS" from the folks at Sitepoint.com.
• I could get a free copy of Zone Alarm Pro

Now you know too! But hurry, like the posting box on twitter - the window is small