Well, currently I do not. However, out students will be getting e-mail addresses next year (yay!), so I will be able to have students create accounts on sites like these. I think using web-clipping tools and bookmarking tools in the research process is so crucial, so my goal is to implement student usage of these tools next year!
I have used Zoho notebook and Evernote. I like them both. My students are not allowed to use their email addresses at school, so they are not allowed to access their notebooks at school. I do know the students prefer using Evernote.