Webparts are available throughout my MOSS sites although they are not available for user 'My Sites'
Are you trying to add webparts on the My Home page or the My Profile page? The My Profile page shares a common layout for all users, however the My Home page should be editable by users.
My plan is to prepopulate the homepages with a a number of webparts - I can't expect every user to add them. How do I go about this?
Where is the MySite template/site definition stored?
Thanks for your help.
I read in a book about Sharepoint that if you edit the System Account's My Site it also changes every other user's My Site. I tried that to see if it was true but it didn't work for me. You should try it to see if it works for you.