Is a PECL a black whole?

It took me a while to find an explanation of what a PECL is. I kept reading comments about things being moved to a PECL but I saw nothing about what is in a PECL or how to get anything out of a (the?) PECL. As far as I knew, there is a danger of all of PHP being in a PECL. I could not (and cannot) find an explanation of a PECL when I start by going to the main php.net page and looking for one. So I searched for "PECL" and got a few results; one result is for vpopmail: http://us4.php.net/vpopmail From that page I clicked on the link for the PECL and then modified the address for the page to get to the pecl.php.net page. Now when I search, I do see in the results the "PHP.net: A Tourist's Guide" page. That appears to be a very useful page. And now that I know to look for it, I do see a link to that page from the main PHP page. So people should be able to find an explnation of what a PECL is, but I just want to say that it might help to make it easier for new people to find the "PHP.net: A Tourist's Guide" page. Perhaps a link to it could be put into the box on the left under "What is PHP?".