Just drag this bookmarklet to your bookmark bar. Click it for a 32 character (letters and numbers only) password.
Password v0.3This has only been tested in Safari. If you are having problems with it, feel free to improve it, or let me know and I might be able to help.
There were a number of solutions out there for this but nothing quite as simple and straightforward as I wanted. If you are looking for a fancy password generator that gives you lots of options, this is not it. If you are looking for a way to click a button and get back 32 random alpha-numeric characters, then this is as easy as it gets.