How many people search for “bmw”, then search for “mercedes”? What percentage of users who search for x, also search for y? How do users refine their queries.

It can be difficult task to extract this information, however MSN have an interesting tool that allows you to do just that. Doesn’t work too well in Firefox, naturally.

Check it out here, along with various other interesting search and statistics related tools from MSN  AdCenter Labs. (Thx Barry)