EasyStickyNotes

Easily create and display sticky notes with this app. You can register notes using voice or text in an instant!
Even when you're short on time, you can add notes with a single tap from the widget.
Registered notes automatically appear in the Notification Center.
With your sticky notes in the iPhone's Notification Center, you'll never forget anything again.

Choose between voice (available from the widget only) or text to create notes.
The paid version allows unlimited note registrations!
The free version allows up to three notes.
You can view, modify, and edit your notes from the app's main screen.

While the free version has note limits and ads, it still offers a smooth user experience.