The GoogleToSalesforce and SalesforceToGoogle RSSBus scripts can now be downloaded from the RSSBus blog.
Note that Salesforce.com limits access to their API to Enterprise Edition or Unlimited Edition customers only. Yes, you can access it with a Developer Edition account as well, but of course with that you can only have a small number of users and a small amount of storage.
Technorati : atom, google calendar, rss, rssbus, salesforce.com