iOS: If you're in the midst of a research project on your iPhone or iPad, you don't want to open the Evernote app each time you find something you want to save. EverClip solves this problem by monitoring and saving content from your clipboard in the background.
You'd be forgiven for thinking that this wasn't possible on iOS -- I was certainly sceptical -- but it really does work. All you have to do is launch the EverClip app once, then go about your business in any other iOS app. For the next 10 minutes, EverClip will automatically grab any images or text that you copy to your clipboard, and even play a distinct pinging noise to verify that the clipping was saved. So you could grab a URL from Safari, some text from Reeder, and an image from your camera roll, all without opening the Evernote app or EverClip in between.
Once you're done clipping, hop back over to EverClip to organise your note. You can select any combination of the clippings to add to Evernote, rearrange them, add an additional photo or text note, then export it to your default Evernote notebook. Unfortunately, EverClip isn't a universal app, so you'll have to pony up $2.99 for the iPhone version and $6.49 for the iPad version. However, if you frequently use Evernote from your mobile device for archiving research, it's well worth the cost.
EverClip for iPad ($6.49) [App Store]