Code size: Medium
Documentation: Little, but sufficient.
Ease of use: Very easy - just upload one file.
Options: User can choose to show line numbers joined or separate from code, or no line numbers; also to show the form on the same page. In the script, you can also easily change the default syntax highlighting colors, allowed extensions, and maximum upload size.
How to call the script: Just enter the URL for the script (it can be renamed), and browse for the desired file on your hard drive.
Comments: Most useful on local servers when programming. You can browse the files on your hard drive, and see the code's line numbers and highlight the syntax.