Know Your Keyword Position on SERP

How would you know the position of the keywords your optimizing on Google or Yahoo (or MSN or Live)? Do you manually search for it and look for your blog post on each and every page… say till you reach the 10th page and decided to stop and that your post is nowhere to be found in the search engine’s SERP? To tell you with all honesty, I do.. or did that till Allen of Silkenhut post a tip (a site) where...