I have release the Paypal Pro plugin. Basically this is NOT a replacement for the existing Grails paypal plugin. It allows you to directly interface with a Paypal Webpayment Pro account. This is a service provided by Paypal that you have to pay for each month but it allows you to take payments on your website via forms on your website without the customer ever getting redirected to Paypal.
The plugin is all working and i have been using it on www.ebookstamper.com for the last few weeks.
Check it out here: