Help to archive the internet by running a virtual machine and donating some of your bandwidth!
I have yet to try this out but I'm glad they have something in place, though perhaps something based off of the @home/boinc software would be better.
Edit: Updated with a better link, previously linked to the wiki
Edit2: I was mistaken in thinking this was related to Archive.org, it is not -- but the data can be uploaded there too.
After having given it a go, my verdict is: Needs improvement.
It was not clear when projects were working, and when it reports that a project should have ended 35 days ago it makes you wonder!
It doesn't let you work on multiple projects at a time, which would be a good way to bypass the rate-limiting and blocking put in place by websites.
The user interface, which I was skeptical about using a VM for, actually works pretty well, so that is a definite boon for the project.