Check the main rulebook
faq in particular there, it covers some glaring issues in the
brb (not all of them, though). The army-related
faqs aren't as useful unfortunately, as some of them are dated and others non-existend (wood elves and brets for example). Offically that's as good as it gets...
Dire Wolf
Faq is an extensive collection of though out house rules which you can use if you feel like it. Good side is that It covers far more issues than the
GW Faqs.
http://www.geocities.com/mi_whplayers/glwl.html