There's a whole host of commercial tools out there (SEOMoz, SeoBook, Raven, SEMRush) which professionals use, but unless you're making revenue from your site th

There's a whole host of commercial tools out there (SEOMoz, SeoBook, Raven, SEMRush) which professionals use, but unless you're making revenue from your site they're probably not worth investing in. You can however use Google Webmaster Tools that will give you basic SERP data.