After you have created your pages with iWeb, instead of publishing your site to MobileMe, you can publish your site to a folder on a local destination (your hard disk, for example), and then, run iWeb Valet.
Step 1: Select your site
Select and load the saved preset you want to use, or create a new one. All your settings will be automatically saved in presets that you can add, delete, duplicate or rename, and that appears in the Presets list field. Presets are very useful, because you probably would apply the same changes every time you modify and re-publish your site with iWeb.
Step 2: Customize your site
Select your local site URL: this is the folder, in your Hard Disk, where iWeb has published your site. Select the Browse option of the menu and navigate to the local folder you published your site in. Finally choose the customization you want to add to your fresh published site, then click the button Apply Customization.
Step 3: Upload your site
Configure your remote account and connection preferences, then click the button Start Upload to preview and upload your site. The preview panel lets you check if the files to synchronize are those you expected, to avoid errors due to local or remote URL wrong settings.