How to edit your iGoogle tab themes en masse

This appeared first on my personal blog, but I hope you find it useful here also.

If you’re like me (and God help you if you are), you have an iGoogle home page set up at www.google.com/ig that displays all of your favorite newsfeeds, weather, etc. You may even have gone so far as to create a custom theme using the new ‘theme maker’ or are using one of the thousands of (slightly tacky) themes already available.
In addition to that, you may be slightly OCD about organizing your stuff into multiple tabs…me, I have 18 (Mac, …