I love free tools, especially ones that have a very intuitive interface and are clean. There are many rank checkers out there. If you plan to check rankings of sites regularly like I do, I highly recommend Agent Web Ranking. It lets you run rank checks for multiple projects and for multiple keywords and returns accurate positions.
The Website Metrics Reporting Tool returns data from 16 of Google’s Data Centers, MSN and Yahoo. Other information included are PageRank, backlinks, last cached date, and indexed pages. You can enter two keyword phrases at once and it returns the positions within the top 100 results for each of the search engines.