Pastebin services are usually one-trick ponies: they allow you to publish and share code snippets, and that's about it. But Commie brings something new to the table: this pastebin service allows you to add inline comments to a code snippet after it has been published.
Previously, I wrote about a simple PHP script for uploading and hosting images, but if it's too limited for your needs, you might want to take a look at the Fotoo hosting app.
Linfo provides an alternative to the previously covered PhpSysInfo script. Install Linfo on a remote server, and you can quickly view essential info about the machine's hardware and software.
Not comfortable with hosting images and files using third-party services? If you already have a Linux server, then you can easily turn it into a no-frills file hosting solution using a PHP script from sebsauvage.net.