By “change isp’s”, do you mean the company you pay to allow you access to the ‘net (either by dialup, dsl, whatever)?
If that’s what you mean, your blog will still be accessible from the new dialup provider, dsl, or whoever.
Or do you mean you’re changing your server host? If that’s what you mean, then please see the tutorial here: http://tamba2.org.uk/wordpress/move
