Open Notepad, click on the "DeskPins" icon on the Taskbar and then click anywhere within the Notepad window to keep it on top. Go to Dropbox.com and download the Always On Top ZIP file.

Tiny but full-featured, Metapad could become your default notepad application. Metapad wants to completely replace the built-in Windows notepad, and some of the features being offered in Metapad ...

If you've ever wished you had a quick-access scratchpad in your OS X menubar, there's a quick and easy way to get one with free site-specific browser application Fluid and an HTML document.