Lots and lots of bookmarks...haha...with subcategories...everything has a place. And I have a really organized boxes with tons of files that hold everything that I print off and need readily available...so that I can always find what I need...including bills...mail etc.
I believe that by trying to stay so organize online, there are many ways of doing that, but the best thing to me is to memorize all of your accounts and passwords from each website. If you go onto them more, it won't be so hard for you anymore.
I've got folders upon folders. A couple times a year I go through and delete the superfluous and organize what's left. I keep very little on my desktop and have lots of folders under other things. I back up my hard drive to an external hard drive about once per quarter just so I don't lose everything.