Then install this if you have been using a different size:
http://wordpress.org/extend/plugins/...te-thumbnails/
Personally I would use excerpt to produce the text and maybe put something like this in functions.php:
Code:
function new_excerpt_length($length) {
return 75;
}
add_filter('excerpt_length', 'new_excerpt_length');
TO change the length of the excerpt to be a bit larger... But then I write larger posts than most people...