E-consultancy has a useful list of “tips for managing your brand on the web”:http://www.e-consultancy.com/news-blog/363733/top-ten-hints-on-managing-your-brand-online.html which also makes for a good checklist against which you judge your own site.
I love the first one:
bq. *Brand standards online are more than just fonts and colour.* A website is an immersive experience of your brand, and your standards should cover everything which contributes to that experience.
This is so true, but in my experience is the one thing that many people working in and around the web just don’t get.