Evernote - find your important info quickly, for free! -
I use it to store emails with important information on, you can just send the email to Evernote through Outlook, or you can add web pages to Evernote with just a right click. This means I can keep my email down to a bare minimum because all the info I need to store is stored in Evernote - and if my computer dies my information will be safe. Evernote, love it!