Simplenote is about as plain as that. You write simple notes, and they are saved automagically to the application. The outstanding function is the online synchronization which allows you to log in and input notes yourself online or simply view the notes you have.
The application starts you off right away with the few options it has available. Creating new notes is a breeze with the plus button, and making a new account with Simplenote is well… simple. Every time you open the application it synchronizes with the online database, making it fast and convenient to use.
Another interesting facet of this application is the fact that it will work in Landscape mode. Simply turn your iPhone at any point while using the application and it will turn to landscape.
Pros: Search option, online synchronization, landscape mode
Cons: no options for rich text editing
Bottom Line: Simplenote is almost a copy of a landmark application, and the addition of one option doesn’t really mean that this app was cut from a separate cloth.
via Simplenote | iPhone Alley.
The following iPhone Notetaking Applications have started to buy traffic on Google Search. Let’s see if it moves them up in the Top iPhone Notes rankings:
Notespark:

Dexy:

Simplenote:

Simplenote. The easy-to-use, syncable, searchable notes application for iPhone and iPod Touch.
Sync your notes
Simplenote is now web syncable. Included with the iPhone/iPod Touch app is access to the web version of Simplenote. Learn more >
Search is easy
Begin typing any search term and the list of notes will narrow down as you type, letting you find what you're looking for instantly. Learn more >
Type more with the website
Included in your purchase of Simplenote is the web app. It's a full-fledged web version of Simplenote with the same search and sync features. Learn more >
Write in landscape mode
Take advantage of the larger keyboard in landscape mode.
Email notes
Have a note you'd like to share with somebody? Now you can email any note you'd like.
via Simplenote – Easy-to-use, syncable, searchable notes for iPhone.
Simplenote, a new app for the iPhone, is like having a notepad in your pocket. A very simple, one goal oriented app, take notes. It works exactly like it should with only two buttons, one to delete your note and one to save it.
Simplenote also has a search function in case your notes queue is overflowing with reminders. The app takes a little time to get acquainted with. Start the app up and you are presented with a blank page and a QWERTY keyboard. The keys are small but with the use of a stylus that is easily overcome. Tapping on the screen in certain places doesn’t do what you would expect such as when creating a new note, tapping a blank area below your list of notes that have already been made do not allow you to start something new. Instead, you type your title into the search bar and press ‘return.’ The result is a new note with a big, fresh page for typing. You can use the search bar to find previous notes by just beginning to type, the most relevant search results appear, listing the most recently saved notes first. There are not a lot of fancy options in this app, but it does what it’s designed to do.
via Easy Note Taking On iPhone with Simplenote | Apple iPhone App Reviews | iFones.com.