I think it's also important on a webapp homepage a try it button (without registration). I think a lot of people want to try something before they start using it.

love the usability walkthrough's. would be nice if they showed some examples of what doesn't work too.

If you are looking for some of that, another excellent read is the book "Dont Make Me Think" by Steve Krugg.

what doesn't work: http://clutterme.com

Speaking personally, the front page of clutterme looks good. It's the samples that put me off. :/

I agree... are you trying to avoid giving information away with those samples?

We were, now I guess the cat is a bit out of the bag. I've touched the samples up a bit. Hope they are a bit better.