There is one piece of software, that I have found to be invaluable since I started using it last fall.  It’s call 1Password.

It seems simple enough.  What it does is keep track of all your logins names and passwords and fill in the appropriate text boxes with one or two keystrokes.  But that’s not all it does.  It can keep track of various identities you use to join up with various forums or shopping sites and with one click fill in all the data for you.  Not only that, it can keep track of “wallet” items like credit cards or secure notes like serial numbers on purchased software.  All of this is kept on a secure separate keychain.

So if you use a Mac, check out 1Password.