Coen Jacobs

Makes it easy to display a link to your own PayPal donation page. Includes options to set a fixed amount and select your own currency.
It adds a simple to use a [paypal] shortcode with a couple of options:
<ul>
<li>text, the linking text</li>
<li>email, the email address corresponding to your PayPal account</li>
<li>amount, set a fixed amount of money in the donation form</li>
<li>currency, the currency you would like to recieve donations in</li>
<li>title, a small title that will be added to your donation</li>
</ul>
Example usage of the plugin:
<pre><code>[paypal text="Do you like this plugin? Please reward it with a little donation." email="paypal@coenjacobs.net" title="Donation for Paypal Donation Shortcode plugin" currency="USD"/]
</code></pre>
Read more about this plugin on the <a href="http://coenjacobs.net/wordpress/plugins/paypal-donation-shortcode" rel="nofollow ugc">PayPal Donation Shortcode plugin</a> page.

Paypal Donation Shortcode

Makes it easy to display a link to your own PayPal donation page. Includes options to set a fixed amount and select your own currency.

Loki

Paypal target meter uses the Paypal NVP API (which means you must have a premium or better account) to display a progress meter of donations towards a monthly or yearly goal. Setup is a breeze, requiring only your Paypal API credentials, and it supports filtering received payments by the email address they were sent to.
You can see a demo of the plugin on the BrainSilo web page at http://brainsilo.org/

Paypal Target Meter

display a progress meter of donations towards a monthly or yearly goal

Paypal Donation Shortcode vs Paypal Target Meter