JotNot 2.0 does a pretty good job of detecting the edges of documents. In case it doesn't (for example, if your original is crumpled) you can use this screen to move the corners of the blue overlay so they match the corners of your doc. Touching "process" creates your document.
You have many way to share your documents in JotNot. You can email a doc to an address, save the page to your photo library for syncing, send the page to Evernote, or send it to a WebDAV server such as iDisk.