Tools like Dropbox or Evernote are great ways to share files across computers, but sometimes you need something a bit more temporary. Hopper is a web app that does just that by providing you with a simple online holding bin for temporarily storing files.
Hopper works somewhat like a clipboard manager. You copy and paste files, text snippets or links directly into the web app. Once they're online, you can share them to another computer with a link, or just use it as a holding bin for resources. You can dump pretty much any file type, text or URL into Hopper, and it sorts everything for you. Its simplicity is its strength and you don't have to create a username to start storing files. It's not nearly as robust as the likes of Dropbox, but as a quick way to store a bunch of links or images it works great.