iGoogle announced that legacy gadget APIs (_IG_*) are deprecated:
http://igoogledeveloper.blogspot.com/2009/09/more-things-change-more-they-stay-same.html
http://groups.google.com/group/Google-Gadgets-API/browse_thread/thread/7f1aa77dcf90064c
Migration guide:
http://code.google.com/apis/gadgets/docs/migration.html
It would be great if there is a migration tool that automate the process.