I was tempted to title this topic "PIE: The Missing Usage Examples", but I'm not that brazen, nor am I sure that any of the examples that I'm using are actually "missing", I probably just wasn't able to find them. I've been using PIE for a little over a month now and I've only recently discovered that it supports transparent PNGs. If you don't want to bother reading my diatribe and just want to see the actual examples, here you go: http://nunyabiz.freeiz.com/css3pie_example.php
When I first started using PIE, I was more interested in being able to use rounded corners in IE 6-8, so that was my primary focus. Like most egotistical male drivers having trouble finding their way to a particular destination, I'm rarely inclined to actually bother consulting an actual map if I have a general idea of where I'm going. In this case, that also usually applies to reading the documentation. That's a last resort if I can't get something to work through other means.
So yesterday when I was answering a question on StackOverflow about rounded corners and I saw some of the existing answers that ranged from people saying that it couldn't be done in IE 6-8 to touting one of the other rounded corner solutions, I felt compelled to mention PIE as a viable solution that I had actually used successfully on a production website. I wanted to provide a link to this site, so after tracking it down I soon found myself reading some of the documentation so I could include some of the other things that it also supports. That was when I noticed that it supports transparent PNGs for the first time and I was elated, because none of the other solutions that I've seen actually seem to work consistently or at all, in other cases. However, I was having trouble finding some code for it in documentation that worked when I tried it. Eventually I figured out how to use it and make it work, but I figured that other people might have trouble themselves, so I thought I would try and be helpful for other noobs. The link to the example is in the first paragraph above.
Hopefully other people will find it useful when they're first getting started using PIE...