Google recently launched a Page Speed Service, an offering along similar lines to CloudFlare. You set up a CNAME to point your domain to their servers, which cache your pages and serve them at blazing speed. They also run everything through the lines of mod_pagespeed to lower file sizes. It’s basically like a CDN for your entire website.
Page Speed Service is an online service to automatically speed up loading of your web pages. Page Speed Service fetches content from your servers, rewrites your pages by applying web performance best practices and serves them to end users via Google’s servers across the globe.
This is targeted mainly at people running small to medium sized websites, such as WordPress blogs, on shared hosting. The service takes the load off your server, so you don’t have to worry about it running slowly or going down from traffic.
Page Speed Service is currently in a trial period, where it’s free for anyone who wants to use it, but it may end up costing more in the future.
It will be interesting to see how this competes with CloudFlare, which offers more features and a free plan that is more than sufficient for most users. (You can pay $20/month for extra analytics and some more advanced features.) CloudFlare isn’t just trying to speed your site up, though. They also want to help protect it from DDoS attacks, email harvesting, and other unpleasantness. It already has quite a bit of traction.