1: search google for something simple
2: Click "show options…" on the sidebar there on the Google results page.
3: Select the option that you'd like to be your new default search (in this case i chose the "Past Year" option to only show results from the past year… cuz i've just had enough forum results from 2006 when i search for "Why the f*ck is IE so dumb!?"
4: Copy the URL of the new filtered results page, then right click the address bar and select "Edit Search Engines…"
5: in the search engines window, click the "+" bottom left, then fill in the details:
6: Select the new search engine you just created, and click "Make Default"… viola!! You're the best around!