Password security: how seriously do you take it ?

Since all of my accounts doesn't have any valuable information, then I don't have to change it

well ,forme my main email addresses is my most important password. I register at many forum, sosial media, etc, with same email address. so whenever I forgot the password, I use that email .

but for email,my password usually changed by my mood. for example, my friend named Yoan owe me Rp 20000 (about US$ 2) at 2012 december, at christmast. because Im afraid I forgot that , so I change my password with her name and her birthday date until she give me back the money

sometimes I also changed it with number and random character, whenever I think they are fun

for me email password is for fun. but I never noted that.

but forum password is depends. for forum like this, that I just use my computer at home to browse here, I just create random password ,and use forgot password feature even tought I remember the password.if you ask why, that because if we are forgot password, this forum would generate difficult one, so I remember that on my browser, and logged in with that. later if my computer stolen or broken, then I use the new password this forum gave me..

I have multiple passwords, varying from easy to übercomplex  , and it depends on the website where I'm registering which password I use.
No offense meant, but for the G4TW forum I use the easy password, mostly because my account here isn't so important.

I don't change my passwords often, mostly because it would take forever to change them all, and I'm a bit of a lazy person myself .
Also, I think it isn't safe to keep written copies of passwords (this is even strongly discouraged by some companies - like banks), online services or local programs are better IMHO.
But of course, the safest way is to remember them, as long as you don't forget them xD.