I've been a big fan of Evernote (http://www.evernote.com/en/) for years. Their free version offers functionality that's what most folks would ever need. Recently, I also discovered ScrapBook (https://addons.mozilla.org/firefox/427/), a great Firefox extension that has the advantage over Evernote of not requiring a full application download and being available directly from my browser, albeit with reduced capabilities. Now along comes Google's Notebook which has the promise of obsolescing both, with the added advantage of being available from any computer with a browser. Since you can also share your Notebook pages, could it possibly be a Clipmarks killer, as well?

GNotebook has much to improve before becoming a threat to Clipmarks.

I wondered, first of all, if it was going to be a threat but I don't think so. I like Google notebook a lot though.