Keep headers/logos under 125 pixels high. It takes up valuable viewing space, especially for laptop users, that is best left for the good stuff to appear"above the fold." Take a cue from the big companies, simple logos done well say it all. This is our #1 pet peeve - screaming logos and headers!
The clean hacked wordpress site Codex has an outline of what permissions are acceptable. Directory and file permissions can be changed through an FTP client or within the administrative page from your hosting company.
This is fantastic news because it means that there's a strong community of users and developers who could further enhance the platform. Whenever there's a group there'll always be people who will attempt to take them down.
Keep control of your assets that are online - Nothing is worse than getting your livelihood in somebody else's hands. Why take chances with something as important as your site?
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There are always going to be risks being online (or even just being alive!) Also it's easy to get caught up in the panic. As soon as we get caught up in the fear, we put the breaks on. This isn't a reaction that is good. Simply take some common sense precautions, then forge ahead. If something bad does happen, it is going to have to be addressed then and no amount of quaking in your will have helped. All is good, if nothing does and you haven't made yourself ill with worry.