I have four Twitter accounts that send out one tip per day. One of these might help you with a New Year’s resolution. If you don’t use Twitter, you can follow these Twitter accounts by subscribing to their RSS feeds. [Update: Twitter really doesn’t want to you to use RSS. I’ve posted a couple times on how to subscribe to Twitter via RSS, and the solutions break over time. I’ve given up.]
Windows keyboard shortcuts
If you’d like to become more efficient in using Windows, and reduce your chances of repetitive stress injury, you may want to use your keyboard more and your mouse less. SansMouse is a Twitter account that sends out one keyboard shortcut per day.
I have two mathematical Twitter accounts. These might be useful if you want to review math courses you took a long time ago or if you want a preview of math you might need in the future. Both are eclectic, mixing elementary and advanced topics.
ProbFact sends out one probability fact per day, mostly theorems but sometimes notes on applications.
I just started AnalysisFact a couple days ago. It will cover a wide range of topics from real and complex analysis. AnalysisFact will have a wider range of sophistication than ProbFact, mixing undergraduate and graduate level material.
Update (31 December 2011): Over the last year I’ve added three mathematical Twitter accounts:
I’ve also added two computing accounts:
Here are the Twitter accounts:
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New Year’s links
Here are a couple posts from Jon Swanson:
And here is a good post from Jurgen Appelo:
Checklist for goals and resolutions.