Wow all these people suggesting online tools must have way too much time on their hands, or rank for nothing and only need to check two keywords. Try Free Google Monitor it's a program, you can load it up with all your keywords and it's just one click to check the lot each time. It goes past 1,000 results, and plots if your have risen or dropped and how many spots.
I agreed with sheds I used Both Tools SEO DIGGER and GEO SEO & it is Better tools Compare With other tools
If he work with only one keyword, it could be a solution. Personally. i think that working with one or few keywords are not enough, long tail is 10 time more interessant . I've got 2 sites & i follow 15 different pages with 140 combinations of keywords. For that i prefer using my tool.