video blog = lots of bw
picture blog = kinda alot
word blog = not much at all.
When you get to the point of sustained world wide attention, you can afford more than two buck chuck hosting. Those are good for starters, and then move up to dedicated/memcache/something better.
The amount of writing to the database (comments) is what can bog down a server, but that’s mostly a problem with forums and not blogs.
My advice: Don’t worry about it. If you’re just curious, poke around the net for sitemeter sites that have public info. It’s just simple math of what’s your average page size, and how many pages do you expect to serve up a month. If you’re maxing out on one, minimize the other, or structure your biz plan to account for it. ie MORE GOOGLE ADS!!!!!*
*Your site will not grow if you launch with google ads everywhere. That was sarcasm.
