This password would be really hard to crack.

T#!$ p@$$w0rd w0uld &e re@lly #@rd t0 cr@ck.

T#!$p@$$w0rdw0uld&ere@lly#@rdt0cr@ck

The passwords for my important stuff look much like the above. Just write a sentence that's easy to remember, replace letters with the special characters they look like and blend it all together. Works a treat.