You can download MemoKeys here.
Once you download and install MemoKeys, you will get something like below :
(1) First click on the 'F1' key or any other key of your choice in that row under "Control Keys".
(2) Next click on any key under "Second Key".
(3) Now in the white box below "Current combination", type whatever you need to type repetitively like your e-mail id.
(4) Next click on the "Set" button at the bottom. If you want to cancel this combination just click on the "Reset" button.
My example shows that I have used a combination of "F1" and "H" keys to type for me abc@hotmail.com. Now if you go to say http://www.hotmail.com/ and in the place where you are to feed the email id, you press the 'F1' and 'H' keys together, then the email id will automatically get saved. You will probably have numerous other texts like name, address, etc. that you need to type in on a daily basis especially if you register on sites every now and then.
A small icon for MemoKeys resides on the right side on your task bar at the bottom of the screen, so whenever you wnat to add more shortcuts, just right-click on the icon and click on "Manage shortcuts". Hope this helps you the way it helped me.