With protopage, you can have an online list of the sites that you frequent as well as a to-do listing of tasks similar to sticky notes. Many people write their own HTML page containing links to frequently visited sites to serve as their browsers’ start page. Protopage would be an excellent replacement for this.
But having been a heavy user of TiddlyWiki adaptations for months now, I don’t see much use for protopage. It is slow in dialup connections because the page saves the positions of the notes and links panel – which you can drag around the page.
If all you want is an easy to maintain page containing a listing of your frequently visited websites and your to-do lists, protopage may serve you well. But if you’re the type who needs more than just a compilation of links and to-do lists – you’re better off opening an account with serversidewiki.com or using ZiddlyWiki on a free Zope server.