What's the best SE rank and position checker tool ?

Ever wanted to know where you rank exactly for a particular keyword or what keywords you rank really well for ? Well I do, but I haven't really been able to find an accurate or useful tool for this ? Are they're any that exist, are they're any that are free to use.

My friends and I just search google randomly and just go down page by page to see where we're ranked. Sometimes this can be as far down as page 23 or something. Is there a way for me to do this more easily and more quickly. Bit of a pain in the ass doing it manually :) lol