I’m using Google Apps for my domain, and trying to enable access to the calendar on my website.
The problem is that I get This feed is read-only error every time I try to add an event to the calendar. Here’s where I post to: Link (dead link)

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You’re using the basic feed, which according to the documentation is always read-only. Use a feed URL ending in
private/fullorprivate/full-noattendeesinstead.(Disclaimer: I work for Google, and as part of implementing the calendar side of Google Sync I’ve had some experience of working with the GData APIs, but anything I write here must be taken to be the views of a private individual rather than as official Google policy etc 🙂