If you really found tags all that valuable, you could start doing them inside comments.
Preliminary report: this isn't going to work, not without drastic contortions in the choice of tags (which IMO kills the effectiveness of the tactic). For instance, from my first set of 30 I tagged a number with the tag "personal", predictions which only concern one user (or two acquainted with each other) and that I don't want to see because I can't effectively assess them. The Google query including "personal" returns close to 30 spurious results: for instance those containing "personal computer" or "personal transportation". (A temporary workaround is to include the term "tags" in the query, but this will cease to work once a greater fraction of predictions have been tagged.)
I doubt you will adopt my suggestion
You are correct about the likely outcome, but I think I've just proven your model of the underlying reasons wrong: I won't do it because it won't work, not because I lack the conscientiousness to do so, or because I'm too selfish to take on an effort that will benefit all users.
The Google query including "personal" returns close to 30 spurious results: for instance those containing "personal computer" or "personal transportation".
JoshuaZ has (example) been adding brackets to the tags, such as [economics]. You don't mention forcing Google to include the brackets, so it's not surprising it includes those extra results.
A tournament is currently being initiated by the Intelligence Advanced Research Project Activity (IARPA) with the goal of improving forecasting methods for global events of national (US) interest. One of the teams (The Good Judgement Team) is recruiting volunteers to have their forecasts tracked. Volunteers will receive an annual honorarium ($150), and it appears there will be ongoing training to improve one's forecast accuracy (not sure exactly what form this will take).
I'm registered, and wondering if any other LessWrongers are participating/considering it. It could be interesting to compare methods and results.
Extensive quotes and links below the fold.
A general description of the expected benefits for volunteers:
Could that be any more LessWrong-esque?
More info: http://goodjudgmentproject.blogspot.com/
Pre-Register: http://surveys.crowdcast.com/s3/ACERegistration