I've been happy the the results supplied by Ocean's Browsercaps. It supports crawlers that Microsoft's config files has not bothered detecting. It will even parse out what version of the crawler is on your site, not that I really need that level of detail.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…