Rankings over time in the past?

Anyone know of a tool that can show me historical rankings?

[geoinct]

Let's say I have a new client and we determine some number of important keyword phrases. It would be helpful to have tool that can check what the rankings were for some periods in the past

[mona]

Hi, geoinct. Search for 'ranking software', 'keyword ranking software', etc. in the search engines - there are plenty of 'em out there.