Here is a summary of actions the Anonymous Monk can not do which a user with an account can do. As an Anonymous Monk, you can not:

• update your own post (to fix mistakes, add info, etc.)
• up-vote or down-vote nodes
• customize your settings (display settings, nodelet settings, etc.), which are far too numerous to list here.
• "Check for newer nodes" in Recently Active Threads or Newest Nodes
• post to the ChatterBox
• post to the Q&A section (either a Question or an Answer)
• post to the Tutorials section
• post to the Book or Module Reviews section
• be eligible to join groups
• be notified of new changes to PerlMonks via Tidings
• send and receive private messages (exception)
• edit your home node
• edit your scratchpad
• moderate or consider nodes
• search for your old nodes (as distinguished from all other Anonymous Monk posts)
• view the reputation (and vote spread) of your own nodes
• view Worst Nodes
• view the contents of reaped nodes
• view the scratchpads of new monks (Level 3 and below)
• read/edit some of the wikis on the site (see jdporter's reply for details)

(Some of the above require a registered user to first attain certain privileges.)

I plan to refer to this list to remind myself of an Anonymous Monk's limitations.

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Update: refined due to jdporter's 1st and 3rd replies, and ambrus's reply.

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