So I'm taking the questions to Quotidian Light's readers, many of whom I know keep personal journals as well as blogs. How does your blogging differ from your personal journaling? Subject matter? Tone? Structure/construction? Editing time? Audience considerations?
My thoughts and observations are below (also posted in Stick Poet's comments: see link above), but what I'm really listening (watching?) for are yours. The question has me analytically curious.
My personal journaling is freer to contain fragments of drafts, partial descriptions, personal matters, my plainly stated, actual feelings and opinions on things, daily news and happenings around me and furiously scribbled snarly bits when I'm having trouble sitting through church. In short, it's more personal both trivially and on the deepest levels.
My blog writing is always done with a strong sense of audience--sometimes prohibitively so. I spend more time changing details, deleting the unnecessary and choosing specifically suitable words to obtain the effect I want upon my readers. I avoid topics (namely religion and politics) that I feel tend to stir people up in individually unproductive ways, and I go for something that either highlights an inner universal human experience and/or state of being, or the simply silly (because there's only so much inner universal human experience one can stand to read about--and certainly to write about!--at one time). My personal journal does contain a great deal of these deeper ponderings (much more than the blog), but usually not as much of the "blogfluff", although it has rather a lot of other sillinesses tracked across its pages.