Google does a great job with most everything. From Google Reader, to Docs, to Calendar and soon to Voice, (plus much, much more- just check out the Labs) they continue to churn out quality products that meet needs. As a search engine, Google is still the default for most people, and for good reason. However, if you are looking for an alternative, try Wolfram Alpha, a new site that will not only give you search results, but help to intelligently analyze the results for you.
At Wolfram you could compare the financial reports from two companies, check the weather record in your area for the last 100 years, complete complex calculus problems, or just about anything else you can think of.