I managed to successfully upload my listings for all three of my etsy stores into Google Base tonight. There's a very informative thread in etsy Forums:
Just follow their step by step instructions. They have an entire blog about it:
Use the www.letset.com google base formatter and download your bulk feed XML file.
You'll need a google login, but beyond that registering your feed file with google base and uploading the file aren't difficult or time consuming at all. If you get a "failed" message, read the info listed beside the error for hints and tips and try to correct the problem, before uploading again.
But if you've set up your Google Base account properly, this system works well. Remember to renew these items each month as they will expire in 31 days!
Hopefully now I'll be able to find my listings in http://www.oodle.com!!!