Yahoo! Pipes: Get-Remix-Deliver model

Yahoo! Pipes is an RSS mashup application from Yahoo. It allows you to merge, sort, filter and combine RSS feeds. Since it is primarily a remix/mashup application, I’ve tried to list its features in my Get-Mix-Deliver model:
Yahoo Pipes

It’s easy to get excited about Pipes. I like working with it, because the UI paradigm (flowchart-based) matches the way engineers think. I’ve been testing it out a bit and while it is a very slick version 1.0, there are a number of features missing, in my opinion, some of which are crucial: