Photo credit: Juri

1. TringMe: Embeddable web-widget lets you receive calls and messages from any visitor on your page
2. Meebo Me: Chat with any person visiting your blog or web-page
3. Pladeo: Create widgets to embed on your site and chat with visitors
4. MovaMessenger: Connect to any instant messenger network from your mobile phone

1. TringMe
   
   TringMe is a web-widget that allows your website visitors, friends and customers to call or leave a voicemail to you directly from the web. You just have to register to the service, get the widget, put it on your website and, when someone clicks, you will instantly receive a call or a voicemail on your existing cell phone, landline, Gtalk or via e-mail. Free to use.
   http://tringme.com/





2. Meebo Me
   
   Meebo Me is a new service from Meebo, that allows you to place a widget on your web-site and chat with your site's visitors. After a simple registration, you can personalize your widget with a title, display name, custom size, fonts, and more. When done, you are given an embedding code to place your chat on any website and start chatting with your visitors. Free to use.
   http://www.meebome.com/





3. Pladeo
   
   Pladeo is a web-based tool for creating widget chats for your blog. Without any registration, you can create as many personalized widgets as you want. After you select the type(client or blog), and the color. you can immediately get the embedding code and place it on your page. Completely web-based and free to use.
   http://www.pladeo.com/





4. MovaMessenger
   
   MovaMessenger is a mobile instant messenger that works on any Java enabled phone. As long as you have a GPRS connection, you will be able to connect to MSN, Yahoo, AIM, ICQ, GTalk, QQ, Jabber and more networks right from your cell phone, no matter where you are. You can download it from your phone, install it and use it for free.
   http://www.movamessenger.com/