The Google toolbar is a better alternative for IE users. It adds more functionality.
belama, the registry tweak simply forces IE to use Google for searching, rather than the MSN search engine it's set to use by default.
My own choice:
Firefox rather than Internet Explorer. I have Google set as the default search engine, and it gives me a drop down box I can click on if I wish to use Dictionary.com, Wkipedia, eBay, Yahoo or any other engine to search with.
I consider that loading a website page for the search engine before performing a search is about the clumsiest and worst way to do searches. Much better to simply type the search terms into a box and then click a button!