Based on my tutorial adding-a-yahoo-messenger-status-on-your-blog. I have develop an easy widget plugin for Wordpress. you may download it at www.johnmartin.ws. I hope you’ll find this useful.
Simply upload, place your widget in the sidebar and set it. and your done!

There are 9 looks to choose from

Enjoy!
This is a Do-It-Yourself instruction on adding a YM status on you wordpress sidebar.
Steps:
1. Login to your admin area on your wordpress blog.
2. Click Presentation
3. Click Widgets
4. Add a Text Widget
5. Drag the widget to the sidebar area
6. Config The Widget
7. copy and paste this code
<a href=”ymsgr:sendIM?YAHOO_ID“> <img src=”http://opi.yahoo.com/online?u=YAHOO_ID&m=g&t=2&l=us”/>
</a>
8. Repace YAHOO_ID on the code with your ID
9. Click Save changes
10. Your YM Status is now ready!

