I for one will never block an anonymous user until I've dropped three warnings on his or her talk page. I know some people are reluctant to use this form of communication (perhaps due to a generalized lack of feedback from the anons themselves :) but I view it as more of a place to document problems with the user, rather than purely for communication.
I won't block a user either, until three warnings that specifically state what they're doing wrong, and that are 5 minutes apart, so that I can expect them to have read the warnings (exceptions can be made for suspected bots). That's why I made {{test2}}, {{test3}}, and {{test4}}. I've been frustrated in the past sometimes, when I'm in the process of working my way through this sequence, and another admin decides that no more warnings are necessary and blocks the user, when I really haven't been minding cleaning up after them. I think we should standardize the process. That way the series of warnings can be fine-tuned, and any admin going to a talk page knows what has been said to this user and what to do next.
moink