Googler makes it easy to search the Google you want, when you want. Give a prefix like news: (as in news:iraq) to search Google News or images: to search images. Prefix with mid: to retrieve a news messages from Google Groups or ? (as in ?aaron) to do an "I'm Feeling Lucky" search.
If you're a IE/Mac user, you can integrate Googler into your address bar (just use http://www.aaronsw.com/2002/googler.cgi?secret=on&q= as your magic string). If you like this, you might also like ADTRT, which does everything Googler does and more! Also, check out the Google Weblog for more Google tips and tricks.