Quicklisp stores nearly all its files on Amazon's file service, S3. S3 is extremely reliable and highly available, and is a great value for sharing files with the world. I use my personal Amazon Web Services account to pay for it. I also use that Amazon account for hosting files for xach.com, wigflip.com, and other miscellaneous things.
Today I will make the transition from my personal Amazon account to a new, Quicklisp-only Amazon account. With that transition, it will be easier to use your many generous donations (thank you, Quicklisp users!) specifically for Quicklisp-related expenses.
The transition also means that the availability of beta.quicklisp.org might be interrupted over the next day or so. The quickstart file, quicklisp.lisp, will be unavailable for bootstrapping, and you will not be able to fetch any project archive files for installation.
Sorry for any inconvenience it causes. I started Quicklisp in part because website and version control outages made it hard to get Lisp software in a predictable, reliable way. I hope this short period of transition will be the last Quicklisp outage for a long time.