If you need to detect browser capabilities, browser settings, Java, JavaScript, or Flash, then I would strongly recommend you download cyScape BrowserHawk and give it a test drive.  I found the product to be very mature, well-documented, easy to use, and full-featured.  What issues I did encounter were "user error" (i.e., my fault), but even still cyScape's support was very responsive and helpful.  While researching the market for browser detection controls, I couldn't find any real competitors -- BrowserHawk is the solution unless you want to build your own or live with the very limited capabilities of the ASP.NET Request.Browser object.