I've started using passphrases which tend to be far longer than passwords but much easier to remember. I discovered that the game account management on net-7.org will allow you to set a significantly longer password than the game client will accept. The game client seems to be hard-coded to a limit of 20 characters. As a result the net-7.org account management should disallow any password over 20 characters (and should definitely not silently truncate it to 20 as I've found some sites to do!)