If you've gotten good at ignoring your own plain-text notes made from the native memo pad on your smartphone, you might want to take a look at BugMe. This productivity app lets you get as flamboyant or manicured as you'd like with multi-colored handwriting or type, the ability to import a photo, and an in-app recorder to send yourself voice notes. A companion app lets you annotate screen shots the same way. Like any good task app, you can bug yourself by setting the note to chirp in alarm, or dig deeper by sounding multiple alarms for the same note.
From Electric Pocket:
Jot quick notes as you go. Make a quick sketch, draw a map or a doodle. BugMe's notepad captures what you draw directly on your handheld's screen, making note taking fast, easy and accurate. Import pictures and photographs, or take screenshots of applications and use these as your notes. Send your notes from your mobile, giving you a great way to exchange informal notes, sketches with colleagues and friends.