There's a cool widget out there for all you authors on the go. The Twitter widget allows you to post whatever is happening with you, your book tour, or anything else you'd like to inform your readers about, right on your website. The look and colors are customizable, to a degree. Have a look at mine on www.southerncrime.com
The application itself is just a few lines of code, free with your (also free) Twitter account. Check it out!