With Zimilate you use a bookmarklet from the browser to clip things, or email from a mobile to save pages, notes, etc.
What is the advantage over using Postach.io? Well, Postach.io is no longer free. It’s not expensive though, and it enables you to post to your Evernote account and have it automatically post to Postach. on your own web page.
The ‘read later’ function from Instapaper clips web pages – and it syncs with your phone. It’s starting to look like a good choice to re-read things you see – but it doesn’t give you a web presence like Postach does, if that’s important to you.