] My Search History lets you easily view and manage your
] search history from any computer. This feature of Google
] web search enables you to find information you thought
] you lost. And over time, you'll see an increasing number
] of relevance indicators in your search results that help
] you find the information you want.

So, Google retains all of this data whether you like it or not. If they are going to do that, its nice to be able to access it and put it to use. So this feature isn't really a bad idea. However, I'd rather have some local software doing this kind of profiling for me and have google politely toss my search history in the bin.

Big Google is watching you