You may or may not know that Twitter was "hacked" recently and the key lesson from that was that passwords are essential - good passwords that is. Changing them every so often is also something you should do. It's a pita but it has to be worth it.
There will be others that cost or are free.
There are ways to sync these using Dropbox - http://getdropbox.com - across machines.
The blog I need help with is mark.wordpress.com.