For those that haven't already come across this, I wanted to draw your attention to Derek Brown's blog. Derek is in the process of planting a church in the DC area and has demonstrated a great deal of his own wisdom and humility in asking other church planters for advice.
I suggest that you place a bit more weight in the advice of those that have seen some fruit and longevity from their labors than my advice which comes almost exclusively from colossal mistakes that I made and watched others make.
You wanna be a true friend to them? Be honest, and unmerciful (quote).
My advice, in addition to the things I shared with Derek-- is find some of Lester Bangs' friends and ask them to be ruthless in their analysis and critique. Beg them to continually critique everything from your character and personal life to church values and culture to aesthetics to music to preaching to what a first time visitor might think about your service format or logo. Find those friends, and listen to their advice. (and believe Lester Bangs when he says that "The only true currency in this bankrupt world is what we share with someone else when we're uncool." quote)