rememeberthemilk.com is nice.
Personal and small business information manager: Get organized, Backpack too.
But I strongly suggest you only use web apps for web related content (bookmarks, rss feeds etc.. no text files, phone numbers, todolist or notes etc). Simply because these are things that are useless if you are offline, while the others must be available being at any time being offline or not.
That's the reason why i dropped google docs.