timmmay: I've used builderscrack but I'm not recommending it any more. When you award a job to a tradesman you have to rate their workmanship and performance, before the job even starts. I contacted them about it and didn't get a reply. I left a comment on their blog and it says "awaiting moderation". So all in all it seems to be abandoned, or at least very poorly designed and supported.
Looks like they are still going, because after visiting their website, I am now getting their google banner adverts appearing. I think the nocowboys website is another one of these websites that rates tradesmen.