Baez has been blogging about math and physics since the pre-blog era. He's got some thoughts on whether mathematicians should blog (PDF):

Should you blog about mathematics? Judging from what I’ve seen, you should do it if you like explaining things, enjoy public discussions, and can deal calmly but firmly with arguments that get out of hand, or the occasional troublemaker. Some mathematicians are too worried about making a fool of themselves in public to enjoy blogging. Others are too afraid of offending people. And if my joke about “idiots” bothered you, blogging may be too hard-knuckled for you.

Baez of course is enthusiastic about blogs. He goes on to say that mathematicians uncomfortable about writing a blog should still get out there, enjoy them, and be part of the community.

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