I have tried the Google Webmaster tools for one of my sites and it shows my site ranking 18th under one keyword but I noticed that is only in the Google Image search. I don't see the site in first 10 pages of the regular Google search.
How can I determine the SERP for my site? I don't care right now if it is in like 40,000th place. At least, it would give me a number so I can determine if my ranking is improving or not.