grosbouff

Tip of The Day is a plugin that display random tips, quotes, polls… for your users, in a widget.
=Features= 
* Widgetized 
* You can make a poll of your tip. The logged users will be able to answer to it and you’ll see the results in the dashboard. You can set custom answers. 
* Uses custom post types and taxonomies, very easy to admin the tips. 
* Ability for a logged user to hide a tip definitely. It will no more appear to him. When creating your tip, you can choose if it is hidable or not. 
* Ajaxed. You can refresh the tip, close it, answer to a poll or hide it definitely without leaving the page.
<h3>Know Bugs</h3>
<ul>
<li>Fatal error at the activation (function duplicated ?)</li>
<li>Ajax functions not firing when using WP (it works with BP)</li>
</ul>

Tip of the Day

Tip of The Day is a plugin that display random tips, quotes, polls... for your users, in a widget.

phonebook

This plugin inserts a TipMe icon in WordPress posts if the user has a Twitter username and has put the Twitter link in their website field of their profile. 
TipMe buttons for BBPress posts are inserted so users can get tips if they just have a 
Twitter link defined in the website field of their profile.
In short, it creates a tweet that the ChangeTip bot pics up and delivers with just one click.
We are using it on some of our web sites, so thought others might enjoy using it on theirs, but it comes without any warranty express or implied, and should be used at your own risk. It is a quite simple concept so should be quite reliable.
This probably will work with earlier versions of WordPress, but has not been tested.

TipMeWP

Inserts a "Tip Me" icon in WordPress & BBPress posts if user has a Twitter account & has put the Twitter link in website field

Tip of the Day vs TipMeWP