Chrome to Phone is an app/plugin combo which sends webpages from your browser to your cellphone, and it’s now all ready to go on Windows Phone 7. You can grab it from the Marketplace, and then set up this Chrome extension.
If you don’t use Chrome (you should try it, it’s super speedy!) then you’re in luck, because the plugins crafter has figured out how to get it to talk with other browsers too, so you can send pages from Safari, Firefox or IE to your WP7 phone.
If we could just get Instapaper on WP7, it’d be even better.