I only have two passowrds that I use almost for everything and I remember them. Actually I have third for my online banking that was generated by bank system. And I also remember it. So, totally three passwords which are easy to keep in mind when needed
I use a few different variations, and yes I bloody forget. I have around 30 for different things. I now have them all written down and locked in a draw. I don't like the idea of having them all the same.
Wouldnt it be better just to write them down in a notebook (hand written), personally I have about 5 different passwords for my login/email/ebay/paypal/college password
I have some 15 email passwords along with 10 other important online transaction passwords. I remember the most important 10 passwords. Remaining things were stored in the computer (safely?)