Blog post image sizes.
Is there a "best practice" for setting image sizes that will be used in blog posts? I've never used WP
as a blog platform and the few times I've tried, I always get flummoxed when it comes to adding images to the posts.
The problem I'm having is that the image I want in the post is 640px wide and it's extending beyond the borders of the blog's text column (<div class="content_left">).
Is it possible to size it down so it fits the confines of this column just perfectly in WordPress? How? (please don't make suggestions for photoshop or image editing outside of wordpress)