We've all experienced it -- that sinking feeling in the pit of your stomach when you realize that text you thought you copied actually didn't make it. Then you realize that you've already closed the source and cannot access it easily. Thankfully, there are several resources, both free and paid, that will prevent that from happening and make it look like you've got it all together.
Download Clipboardic by NirSoft. It's a free download that keeps a running list of your copied items. Once you download the Clipboardic .exe file, there's no need to install a program. Simply run the .exe file and a window pops open. Each time you copy an item, it appears in the window.
Download ClipDiary for a free trial of their paid program. With ClipDiary, a window runs in the background, collecting everything you copy to your clipboard for later use. This utility will accommodate links, text, pictures -- anything you want to copy. With the click of your mouse, you can even strip formatting from text for ease of use. After the initial 30-day trial, ClipDiary will offer you the opportunity to buy a full license.
Are you using a Mac? Try JumpCut. This program will add a tool to your menu bar that collects your copied items for later use.