Many blogs highlight the author’s comment in the comments section. You can use many plugins to get this effect(For eg., the Highlight Author Comments Plugin) – but you don’t have to. You can get the get the same effect by adding a small bit of code to your theme.
I am working on a mini shopping cart plugin for WordPress with Paypal integration. Its been a while since I worked with paypal – so I ran into trouble. I have a couple of sandbox accounts – and the payment goes through without any visible issues. But the IPN’s notify_url was not being called no matter what I did.