What do you mean by Google? Google Bookmarks, the Chrome sync? Google Notebook? :)
Oh, just Google's search. If I want to find something I previously read I Google it now instead of sifting through crufty, old, poorly organized and needlessly hierarchical bookmarks. Tagged bookmarks would help there I guess (like Delicious) but then you have to tag everything...
The nice thing is that I can "bookmark" any link from any browser that I use, as well as twitter and RSS. And I have them instantly on my iPad, phone, notebook, or any machine with a browser without installing any software or extensions.