I use a password manager...
Which one? And does it require you to log on?
KeePass is the one I recommend. I've used it for around 10 years now, though when I started using OS X a while back I switched over to 1Password because KeePassX didn't support KeePass 2.x databases. Now I'm off OS X so back to KeePass (and last I heard KeePassX (the Linux and OS X port of KeePass, if it wasn't obvious) is working towards KeePass 2.x database support, if it hasn't already been implemented. KeePass 1.x databases are fine for most things, they just don't have the full range of fields that 2.x has, so storing things like credit card information, software license keys, server/router/etc configurations isn't really possible. If you just need passwords, 1.x and KeePassX is fine.)
There are browser extensions for Chrome and Firefox (not sure about IE) that you can use to quickly pass login information from KeePass to a website you're logging into, or you can use KeePass's built in Auto-Key function, which isn't perfect but generally pretty good. Or simply copy & paste from KeePass to the login prompt if the previous options aren't working. And there are apps for both iOS and Android (not sure about Windows phone or Blackberry), so you can always have access to them when you need it.
And yes you do need a password to unlock the database, but no you don't need an online login (which is the main reason I don't recommend LastPass, I much prefer to keep my password database offline). I also don't allow Chrome or Firefox to store passwords, more for my own peace of mind than anything. And since it's just the one password that you need to remember (or write down and keep in a safe place) it's not too bad. Almost anyone can memorize a single password of pretty much any length or complexity.