Vinu Thomas has proposed a replacement for the usual var_dump or print_r sort of debugging developers tend to do - Krumo.

To put it simply, Krumo is a replacement for print_r() and var_dump(). By definition Krumo is a debugging tool (now for PHP5 only), which displays structured information about any PHP variable [...] it does the same job, but it presents the information beautified using CSS and DHTML.

It also supports output of other data in a "pretty format" like backtraces, included files and a listing of all constants. You can check out a demo of it in action here.

The Zend Developer Zone has a nwe post that announces the release of the first version of an API created to interface your PHP scripts with the Website Payments Pro API from Paypal - phpPaypalPro.

It is a framework developed in PHP5 that integrates easily with the Website Payments Pro API from Paypal. Currently it supports 4 major operations available from the Website Payments Pro SOAP 1.1 API. It has taken advantage of the built-in SOAP extension available natively in PHP5 to generate the requests and interprets the responses to and from the Website Payments Pro SOAP-based web service.

Current operations supported include: DoDirectPayment, SetExpressCheckout, GetExpressCheckoutDetails and DoExpressCheckoutPayment and you can get more information about other functionality from the project's documentation. Be sure to check out the sample script and the full SourceForge page for even more Paypal interface goodness.