Àpèjúwe
With this plugin you can add extra HTML or just plain text when posting a new page or post. That content will be displayed in sidebar widget. It is tested from WP 2.6 to 3.0.1.
Àwọn àwòrán ìbòjú
Posting area with ax-sidebar section opened (WP 2.6) 
Sidebar showing that contents inserted in posting area for this post(WP 2.6) 
Added widget in theme menu at admin side (WP 2.7.1)
Ìgbéwọlẹ̀
The Ax-sidebar can be installed and activated in 4 easy steps (also make sure that script mysql user has CREATE permissions):
1. Unzip "ax-sidebar" archive and upload extracted folder named "ax-sidebar" into your "plugins" folder (/wp-content/plugins/)
2. Activate the plugin under "Plugins" menu in admin area by clicking on "Activate" for the "ax-sidebar" plugin.
3. Add "ax-sidebar" widget into sidebar in themes menu and you are set.
4. In posting area you should find now new section named "Ax-sidebar content"
Àwọn àgbéyẹ̀wò
Kò sí àwọn àgbéyẹ̀wò fún plugin yìí.
Àwọn Olùkópa & Olùgbéejáde
“ax-sidebar” jẹ́ ètò ìṣàmúlò orísun ṣíṣí sílẹ̀. Àwọn ènìyàn wọ̀nyí ti ṣe ìkópa sí plugin yìí.
Àwọn Olùkópa
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Àkọsílẹ̀ àwọn àyípadà
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Version 1.0
- Initial release!
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Version 1.1
- Added option to widget named “show only on single post/page”
- Now all sidebar contents will be shown when more than 1 post is on page and “show only on single post/page” is turned off
- Some code improvement
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Version 1.2
- Did nothing new. Fixed some problems, added screenshot
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Version 1.3
- If title is not set, it will not be rendered
- Added possibility to render contents without ul,li tags
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Version 1.31
- Fixed bug wich removed ax-sidebar content when post quick-edit was used in wordpress