switch2mac

With WP-SOS-Donate you can simply add a sidebar widget for help donation e.g for haiti. 
After the plugin is activated, you can drag and drop WP-SOS-Donate Widget to your Sidebar. 
You can choose your own headline, the color of the subline, the charity link and the picture in the widget. 
If this is not enough for your site, you can define your own template.

WP-SOS-Donate Donation Sidebar Plugin

With WP-SOS-Donate you can simply add a sidebar widget for help donation e.g for haiti

thebillkidy

The KumulAid plugin adds the possibility for charities to add a donate button on their website using a simple shortcode.
To add this simply follow the following steps: 
1. Install the KumulAid plugin 
2. Add the following shortcode to any page: <code>[kumulaid id="<ID_OR_SLUG>"]</code>
An example is: <code>[kumulaid id="congodorpen"]</code> or <code>[kumulaid id="98"]</code>
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KumulAid

The KumulAid plugin adds the possibility for charities to add a donate button on their website using a simple shortcode.

WP-SOS-Donate Donation Sidebar Plugin vs KumulAid