First, place the following code in a file and call it "test.php" and then upload it to the root of your blog directory:
<?php phpinfo(); ?>
Make sure that "zlib" is enabled by your hosting provider.
Second, place the following code in your header (above the DOCTYPE):
You're done! Check Port80Software.com to ensure you are compressing your output.
22/10/2009 update : If you're interested in WordPress themes designed for small businesses, you should definitely have a look to the list I have compiled over at cats Who Blog!
Thanks to Brad Ney for hios contribution to WpRecipes! Brad is the author of BradBlogging.com, which is all about WordPress, HTML & CSS and Usability tips and tweaks. You can subscribe to his RSS Feed here.