I found some new bookmarklets today. I've tested them on Mac OS X (10.2) and they work on Mozilla 1.2b, Chimera 0.5 and Internet Explorer 5.2.2. I'll test them on Windows and Linux when I finish this post. To use these, simply drag the link to your toolbar. The first is a google bookmarklet, found via MacMegasite. This bookmarklet opens a dialog with a text box, where you can type in your search query and eliminates the initial page load from google. The second is a small screen bookmarklet, found via blogzilla and glazblog. This bookmarklet shows you what a site might look like on a small screen.
Update: These bookmarklets seem to work best on Mozilla 1.2b, Win/Mac. The google one will work in IE/Mac, but not IE/Win.