For a more robust note-taking experience, check out NoNonsense Notes. The app serves as a full virtual notepad -- and unlike most mobile note-taking tools, it lets you browse through your notes right from your lock screen.
NoNonsense Notes' lock screen widget shows scrollable snippets from all of your saved notes. You can customize it to control its look and feel as well as the types of information it displays.
NoNonsense Notes syncs with your Google account (it actually uses the Google Tasks framework even though it organizes the information into more of a notebook style).
NoNonsense Notes is a free download.