Here is a nice little collection of widgets you can use for your blog.
Mashable - get the latest social networking news from this very site.
Flickr Flash Photo Stream Badge - display images from your Flickr profile with a handy Flash photo stream.
Preview Anywhere - see a live preview of outgoing links in a small popup which activates on mouseover. Some find this annoying, while others might find it useful.
Twitter Badge - if your life is so interesting that everyone must know what you’re up to all the time, then a Twitter badge is the ideal counterpart to your blog. It’ll proudly displays your recent tweets.
Digg News - display the latest Digg links on your blog. Themeable and fully customizable.
FEEDJIT - real time traffic data directly in your blog’s sidebar.
LineBuzz - inline comments for your blog. Very handy for blogs with frequent lively discussions.
Flixn - display a stream directly from your webcam, so your blog visitors can always see what you’re up to.
3Jam - lets your visitors send messages to your mobile phone, without them knowing your phone number.
Jaxtr - with Jaxtr, your visitors can actually call you to your mobile phone; again, your number stays private.