Zenmen- I'm new here too, but welcome.
I prefer to shoot in as high resolution as I can. However, you will probably want to "derez" the image for posting on the web. I like to match the resolution to that needed by the final product (like a power-point presentation) after I have taken the shot.
I agree with the reasons given by Nemisis256. I also prefer RAW but I'm biased because I used to work with microscope imaging- the lossy compression from JPEG could cause artifacts, especially when doing math on the images.
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