Google Talk – Give visitors the ability to talk to you via Google Talk directly from your blog sidebar.
Jaxtr – Create a widget that allows people to call you on the phone without revealing the phone number to them.
Meebo Me –
Meebo Me will allow you to create a chat box that you can install on
your Blogger page, giving you the chance to converse with visitors to
your site.
Skype –
The official Skype widget allows you to create various buttons that can
show your current status and also allows people to just click it and
give you a call.
Tag-Board – Allows you to add a real-time chat board to your blog that your visitors and you can use to converse.
Social Widgets
Delicious Linkrolls – Share your Delicious bookmarks with the world with this easy to install linkroll widget.
FriendFeed Widget – Share all of your FriendFeed activity with the readers of your site.
Google Friend Connect –
A makeshift social network that runs across any site that has installed
Google Friend Connect. You can join a site, see the other members,
play games and more.
LinkedInABox –
LinkedInABox retrieves your LinkedIn profile to display on your blog,
allowing people to look through things such as your specialties and
experience.
MyBlogLog –
If someone visits your blog that is also a member of MyBlogLog, their
avatar and username will appear in the box. You can then click on any
person to check out their profile on the service.
Twitter –
Add your Twitter stream to your blog and display anywhere from your
last tweet to the last twenty. Also gives a link for people to be able
to follow you.
Share on Facebook – A simple widget that allows your readers to share items from your blog on Facebook.
SocialFeed –
A miniature lifestreaming widget that broadcasts your activities on
sites such as Twitter, StumbleUpon, Last.fm and so on. Has several
different skins you can choose from.
Utility Widgets
Add This – The popular social bookmarking button is available for Blogger accounts.
Easy Comments –
This widget allows you to add commenting to any page of your site by
placing the widget at the bottom of a page. Allows people to say if
they liked the comment, includes comment threading and more.
Google Search –
Add an AJAX powered Google search box to your blog that you can allow
to search the web and your blog, or even just restrict it to the
contents of your site.
Popular Posts –
This widget will take a look at your comments, up to the last 5,000,
and generate a list of which posts had the most conversation around
them.
Recent Comments – Display the most recent comments on your blog in this widget so that readers can join in the conversation.
Related Posts – Not so much a widget as a hack, this will give you the related post functionality that so many WordPress powered blogs use.
ShareThis –
The highly customizable green button that ShareThis is known for can be
added to your blog. Choose if you want it for social bookmarking,
users emailing your posts and more.
Shout List Icons –
Be the king (or queen) of social sharing with this widget that
generates icons for over 30 social sites your blog can be added to.
Tag/Label Cloud – Gives you the ability to install a traditional tag cloud in your sidebar so people can see what you write about the most.
Miscellaneous Widgets
Flickr – You can generate an HTML or Flash based badge of your photo stream to share your images with your visitors.
Mashable – Yes, now you too can share the best web-related news on your blog with the Mashable widget.
Picasa Albums – Display your public Picasa albums in your blog sidebar with this handy widget.
Source from: http://goo.gl/7fPDG7
