Good points all.
The worst church sites I've seen belong to the post-modern churches which are trying to be 'super cool'. Usually it's dark text on a dark background, heavy graphics, and little useful information. They'll frequently make you sit through a Flash intro before they'll let you get to content.
The site should say who you are, when and where you meet, and a brief summary of what you believe. A brief history of the group is nice, but not necessary, and I've found it useful if they put up something about worship style. A resource link page adds content without cost or much effort.
I agree. And the who, when and where ought to be quickly accessible; it's nice if it can appear on the initial page. Our site borrows ideas from others: there is a picture or two of "the property", but also some showing the people of the church.
The "brief summary of what you believe" is hard to achieve right up front, though, and where I have seen that done it usually tends to come across rather negatively. We put it on our "Bookshelf" page.