While I don’t use CloudApp personally, I hear great things and it is especially great for sharing screenshots or snippets of code. Cloudier is an iOS client for CloudApp.
But to me, the best part of Cloudier is the way it loads jQuery. The best and right way.
<script src='//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js'></script> <script>window.jQuery || document.write("<script src='js/vendor/jquery-1.8.2.min.js'><\/script>")</script>