Not one to stop tweaking and improving, Zoho's integrated notebook tool recently added universal search, HTML import and export, and tools to move your notes around between notebooks and pages.
Search is the big new thing here, because without a reliable search tool, notebooks lose their ability to help you quickly recall things you once had a dash of inspiration to write. Zoho's right-hand search bar grabs notes from particular notebooks or all of them, and clicking on any results opens that note in a new tab, so you can try a few different spots to find what you're looking for.
The import/export tools make it easy to pull in notes from other web sources that support HTML formatting. Are you a Zoho fan, or a Notebook user in particular? Tell us how you use it, and what still needs adding, in the comments.