Ask HN: Best Password Manager?

Hello all! What with the recent Gawker slip up, it seems as if password related security is on all of our minds. I feel like I am finally being prompted to step up my game and use a real password manager with strong, random passwords for each site that I visit. I know I should have been doing this all along, but what can I say?

Features that I am interested in:

* Android/iOS app so I can access my sites on-the-go.

* OSX/Linux/Windows support.

* Preferably Free and Open Source, if possible.

1password? KeePass? LastPass? What do you use?