Simplenote is a free note-taking app for the iPhone, iPod touch and iPad. It was recently brought to my attention by Lifehacker, and I’ve been making extensive use of it since. As well as the iOS app, there’s a universal web application (which you can sign up for even if you don’t have an iOS device), and there are numerous third-party clients for PCs, Macs and other devices such as Android phones. I use ResophNotes on my home PC, and the web app on my work PC (as I’m not allowed to install unapproved software).
So far, I’ve found the ads to be fairly unobtrusive, but it’s possible to remove them for a one-off payment of $4.99 (around £3), or sign up for the $8.99/year (around £5.80) premium service which also offers additional features such as as automatic backup, RSS and email features.
I’ve previously tried another Lifehacker favourite, Evernote, which provides a desktop client as well as an iOS app, but as someone who just needs to keep track of short, text-based notes, I found it bloated and unwieldy.